LU MINARY M ICRO CO NFIDE NTIA L-A D VA NC E P RO DU CT IN FORM ATION
LM3S8938 Microcontroller
DATA SHEE T
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LM3S8938 Microcontroller
Table of Contents
About This Document .................................................................................................................... 20
Audience ..............................................................................................................................................
About This Manual ................................................................................................................................
Related Documents ...............................................................................................................................
Documentation Conventions ..................................................................................................................
20
20
20
20
22
27
27
28
29
29
30
31
32
33
33
36
36
36
37
37
37
37
37
1
1.1
1.2
1.3
1.4
1.4.1
1.4.2
1.4.3
1.4.4
1.4.5
1.4.6
1.4.7
Overview ............................................................................................................................. 22
Product Features ......................................................................................................................
Target Applications ....................................................................................................................
High-Level Block Diagram .........................................................................................................
Functional Overview ..................................................................................................................
ARM Cortex™-M3 .....................................................................................................................
Motor Control Peripherals ..........................................................................................................
Serial Communications Peripherals ............................................................................................
System Peripherals ...................................................................................................................
Memory Peripherals ..................................................................................................................
Additional Features ...................................................................................................................
Hardware Details ......................................................................................................................
Block Diagram ..........................................................................................................................
Functional Description ...............................................................................................................
Serial Wire and JTAG Debug .....................................................................................................
Embedded Trace Macrocell (ETM) .............................................................................................
Trace Port Interface Unit (TPIU) .................................................................................................
ROM Table ...............................................................................................................................
Memory Protection Unit (MPU) ...................................................................................................
Nested Vectored Interrupt Controller (NVIC) ................................................................................
2
2.1
2.2
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
Cortex-M3 Core .................................................................................................................. 35
3
4
5
5.1
5.2
5.2.1
5.2.2
5.2.3
5.2.4
5.3
5.4
5.4.1
5.4.2
Memory Map ....................................................................................................................... 41
Interrupts ............................................................................................................................ 43
JTAG .................................................................................................................................... 46
Block Diagram ..........................................................................................................................
Functional Description ...............................................................................................................
JTAG Interface Pins ..................................................................................................................
JTAG TAP Controller .................................................................................................................
Shift Registers ..........................................................................................................................
Operational Considerations ........................................................................................................
Initialization and Configuration ...................................................................................................
Register Descriptions ................................................................................................................
Instruction Register (IR) .............................................................................................................
Data Registers ..........................................................................................................................
Functional Description ...............................................................................................................
Device Identification ..................................................................................................................
Reset Control ............................................................................................................................
Power Control ...........................................................................................................................
47
47
48
49
50
50
53
53
53
55
57
57
57
60
6
6.1
6.1.1
6.1.2
6.1.3
System Control ................................................................................................................... 57
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Table of Contents
6.1.4
6.1.5
6.2
6.3
6.4
Clock Control ............................................................................................................................
System Control .........................................................................................................................
Initialization and Configuration ...................................................................................................
Register Map ............................................................................................................................
Register Descriptions ................................................................................................................
Block Diagram ........................................................................................................................
Functional Description .............................................................................................................
Register Access Timing ...........................................................................................................
Clock Source ..........................................................................................................................
Battery Management ...............................................................................................................
Real-Time Clock ......................................................................................................................
Non-Volatile Memory ...............................................................................................................
Power Control .........................................................................................................................
Interrupts and Status ...............................................................................................................
Initialization and Configuration .................................................................................................
Initialization .............................................................................................................................
RTC Match Functionality (No Hibernation) ................................................................................
RTC Match/Wake-Up from Hibernation .....................................................................................
External Wake-Up from Hibernation ..........................................................................................
RTC/External Wake-Up from Hibernation ..................................................................................
Register Map ..........................................................................................................................
Register Descriptions ..............................................................................................................
60
62
63
63
64
7
7.1
7.2
7.2.1
7.2.2
7.2.3
7.2.4
7.2.5
7.2.6
7.2.7
7.3
7.3.1
7.3.2
7.3.3
7.3.4
7.3.5
7.4
7.5
Hibernation Module .......................................................................................................... 113
114
114
114
115
115
115
116
116
116
116
117
117
117
117
118
118
118
8
8.1
8.2
8.2.1
8.2.2
8.3
8.3.1
8.3.2
8.4
8.5
8.6
Internal Memory ............................................................................................................... 131
Block Diagram ........................................................................................................................ 131
Functional Description ............................................................................................................. 131
SRAM Memory ........................................................................................................................ 131
Flash Memory ......................................................................................................................... 132
Flash Memory Initialization and Configuration ........................................................................... 133
Flash Programming ................................................................................................................. 133
Nonvolatile Register Programming ........................................................................................... 134
Register Map .......................................................................................................................... 134
Flash Control Offset ................................................................................................................. 135
System Control Offset .............................................................................................................. 142
9
9.1
9.1.1
9.1.2
9.1.3
9.1.4
9.1.5
9.1.6
9.2
9.3
9.4
GPIO .................................................................................................................................. 155
Function Description ................................................................................................................ 155
Data Control ........................................................................................................................... 155
Interrupt Control ...................................................................................................................... 156
Mode Control .......................................................................................................................... 157
Commit Control ....................................................................................................................... 157
Pad Control ............................................................................................................................. 157
Identification ........................................................................................................................... 158
Initialization and Configuration ................................................................................................. 158
Register Map .......................................................................................................................... 159
Register Descriptions .............................................................................................................. 161
10
10.1
Timers ............................................................................................................................... 196
Block Diagram ........................................................................................................................ 197
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LM3S8938 Microcontroller
10.2
10.2.1
10.2.2
10.2.3
10.3
10.3.1
10.3.2
10.3.3
10.3.4
10.3.5
10.3.6
10.4
10.5
Functional Description .............................................................................................................
GPTM Reset Conditions ..........................................................................................................
32-Bit Timer Operating Modes ..................................................................................................
16-Bit Timer Operating Modes ..................................................................................................
Initialization and Configuration .................................................................................................
32-Bit One-Shot/Periodic Timer Mode .......................................................................................
32-Bit Real-Time Clock (RTC) Mode .........................................................................................
16-Bit One-Shot/Periodic Timer Mode .......................................................................................
16-Bit Input Edge Count Mode .................................................................................................
16-Bit Input Edge Timing Mode ................................................................................................
16-Bit PWM Mode ...................................................................................................................
Register Map ..........................................................................................................................
Register Descriptions ..............................................................................................................
Block Diagram ........................................................................................................................
Functional Description .............................................................................................................
Initialization and Configuration .................................................................................................
Register Map ..........................................................................................................................
Register Descriptions ..............................................................................................................
197
197
197
199
203
203
204
204
205
205
206
206
207
229
229
230
230
231
11
11.1
11.2
11.3
11.4
11.5
Watchdog Timer ............................................................................................................... 229
12
12.1
12.2
12.2.1
12.2.2
12.2.3
12.2.4
12.2.5
12.2.6
12.3
12.3.1
12.3.2
12.4
12.5
ADC ................................................................................................................................... 252
Block Diagram ........................................................................................................................ 253
Functional Description ............................................................................................................. 253
Sample Sequencers ................................................................................................................ 253
Module Control ........................................................................................................................ 254
Hardware Sample Averaging Circuit ......................................................................................... 255
Analog-to-Digital Converter ...................................................................................................... 255
Test Modes ............................................................................................................................. 255
Internal Temperature Sensor .................................................................................................... 255
Initialization and Configuration ................................................................................................. 256
Module Initialization ................................................................................................................. 256
Sample Sequencer Configuration ............................................................................................. 256
Register Map .......................................................................................................................... 257
Register Descriptions .............................................................................................................. 258
13
13.1
13.2
13.2.1
13.2.2
13.2.3
13.2.4
13.2.5
13.2.6
13.2.7
13.2.8
13.3
13.4
13.5
UART ................................................................................................................................. 285
Block Diagram ........................................................................................................................
Functional Description .............................................................................................................
Transmit/Receive Logic ...........................................................................................................
Baud-Rate Generation .............................................................................................................
Data Transmission ..................................................................................................................
Serial IR (SIR) .........................................................................................................................
FIFO Operation .......................................................................................................................
Interrupts ................................................................................................................................
Loopback Operation ................................................................................................................
IrDA SIR block ........................................................................................................................
Initialization and Configuration .................................................................................................
Register Map ..........................................................................................................................
Register Descriptions ..............................................................................................................
286
286
286
287
288
288
289
289
290
290
290
291
292
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