PR E LI MIN ARY
LM3S8971 Microcontroller
DATA SHEE T
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Preliminary
October 01, 2007
LM3S8971 Microcontroller
Table of Contents
About This Document .................................................................................................................... 21
Audience ..............................................................................................................................................
About This Manual ................................................................................................................................
Related Documents ...............................................................................................................................
Documentation Conventions ..................................................................................................................
21
21
21
21
23
29
29
30
31
31
32
33
34
35
35
36
38
38
38
39
39
39
39
39
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
1.4.8
Architectural Overview ...................................................................................................... 23
Product Features ......................................................................................................................
Target Applications ....................................................................................................................
High-Level Block Diagram .........................................................................................................
Functional Overview ..................................................................................................................
ARM Cortex™-M3 .....................................................................................................................
Motor Control Peripherals ..........................................................................................................
Analog 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
ARM Cortex-M3 Processor Core ...................................................................................... 37
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 ....................................................................................................................... 43
Interrupts ............................................................................................................................ 45
JTAG Interface .................................................................................................................... 48
Block Diagram ..........................................................................................................................
Functional Description ...............................................................................................................
JTAG Interface Pins ..................................................................................................................
JTAG TAP Controller .................................................................................................................
Shift Registers ..........................................................................................................................
Operational Considerations ........................................................................................................
Initialization and Configuration ...................................................................................................
Register Descriptions ................................................................................................................
Instruction Register (IR) .............................................................................................................
Data Registers ..........................................................................................................................
49
49
50
51
52
52
55
55
55
57
6
6.1
6.1.1
6.1.2
System Control ................................................................................................................... 59
Functional Description ............................................................................................................... 59
Device Identification .................................................................................................................. 59
Reset Control ............................................................................................................................ 59
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Preliminary
3
Table of Contents
6.1.3
6.1.4
6.1.5
6.2
6.3
6.4
Power Control ...........................................................................................................................
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 ..............................................................................................................
62
62
64
65
65
66
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 .......................................................................................................... 117
118
118
118
119
119
119
120
120
120
121
121
121
121
122
122
122
123
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 ............................................................................................................... 136
Block Diagram ........................................................................................................................ 136
Functional Description ............................................................................................................. 136
SRAM Memory ........................................................................................................................ 136
Flash Memory ......................................................................................................................... 137
Flash Memory Initialization and Configuration ........................................................................... 138
Flash Programming ................................................................................................................. 138
Nonvolatile Register Programming ........................................................................................... 139
Register Map .......................................................................................................................... 139
Flash Register Descriptions (Flash Control Offset) ..................................................................... 140
Flash Register Descriptions (System Control Offset) .................................................................. 147
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
General-Purpose Input/Outputs (GPIOs) ....................................................................... 160
Functional Description ............................................................................................................. 160
Data Control ........................................................................................................................... 160
Interrupt Control ...................................................................................................................... 161
Mode Control .......................................................................................................................... 162
Commit Control ....................................................................................................................... 162
Pad Control ............................................................................................................................. 162
Identification ........................................................................................................................... 163
Initialization and Configuration ................................................................................................. 163
Register Map .......................................................................................................................... 164
Register Descriptions .............................................................................................................. 166
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Preliminary
October 01, 2007
LM3S8971 Microcontroller
10
10.1
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
General-Purpose Timers ................................................................................................. 201
Block Diagram ........................................................................................................................
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 ..............................................................................................................
202
202
202
202
204
208
208
209
209
210
210
211
211
212
237
237
238
238
239
11
11.1
11.2
11.3
11.4
11.5
Watchdog Timer ............................................................................................................... 237
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
Analog-to-Digital Converter (ADC) ................................................................................. 260
Block Diagram ........................................................................................................................ 261
Functional Description ............................................................................................................. 261
Sample Sequencers ................................................................................................................ 261
Module Control ........................................................................................................................ 262
Hardware Sample Averaging Circuit ......................................................................................... 263
Analog-to-Digital Converter ...................................................................................................... 263
Test Modes ............................................................................................................................. 263
Internal Temperature Sensor .................................................................................................... 263
Initialization and Configuration ................................................................................................. 264
Module Initialization ................................................................................................................. 264
Sample Sequencer Configuration ............................................................................................. 264
Register Map .......................................................................................................................... 265
Register Descriptions .............................................................................................................. 266
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
Universal Asynchronous Receivers/Transmitters (UARTs) ......................................... 293
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 ..........................................................................................................................
294
294
294
295
296
296
297
297
298
298
298
299
October 01, 2007
Preliminary
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