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EM6520 4 bit Microcontroller
Features
•
Low Power
- 8 µA active mode, LCD On
- 1.1 µA standby mode, LCD Off
- 0.1 µA sleep mode
@ 3 V, 32 kHz, 25°C
Large Voltage range, 2 to 5.5 V
SVLD, default (2.4V)
EEPROM, 2048
×
16 bits
RAM, 64
×
4 bits
2 clocks per instruction cycle
72 basic instructions
Oscillation supervisor
Timer watchdog (2 sec)
Max. 8 inputs ; port A, port B
max. 4 outputs ; port B
LCD 8 segments, 3 or 4 times multiplexed
Universal 10-bit counter, PWM, event counter
Prescaler down to 1 Hz (crystal = 32 KHz)
1/1000 sec, 12 bit binary coded decimal counter
with hard or software start/stop function
Frequency output 1Hz, 2048 Hz, 32 KHz, PWM
7 internal interrupt sources (BCD counter,
2×10-bit counter, 3× prescaler, SVLD)
5 external interrupt sources (port A, compare)
Figure 1. Architecture
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Description
The EM6520 is an advanced single chip CMOS 4-
bit microcontroller. It contains EEPROM, RAM,
power on reset, watchdog timer,
oscillation
detection circuit, 10 bit up/down counter,
Millisecond counter, prescaler, voltage level detec-
tor (SVLD), compare input, frequency output, LCD
driver and several clock functions. The low voltage
feature and low power consumption make it the
most suitable controller for battery, stand alone and
mobile equipment. The EM6520 is manufactured
using EM’s Advanced Low Power (ALP) CMOS
Process.
Figure 2. Pin Configuration
Typical Applications
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Timing device
Medical applications
Domestic appliance
Timer / sports timing devices
Safety and security devices
Automotive controls with display
Measurement equipment
Interactive system with display
Bicycle computers
©
EM Microelectronic-Marin SA, 9/99, Rev. B/274
1
FOR ENGINEERING ONLY
EM6520 at a glance
•
Power Supply
- Low voltage low power architecture
including internal voltage regulator
- 2.0 ... 5.5 V battery voltage
- 8 µA in active mode (Xtal, LCD on, 25°C)
- 1.1 µA in standby mode (Xtal, LCD off, 25°C)
- 0.1 µA in sleep mode (25°C)
- 32 KHz Oscillator
EM6520
•
Prescaler
- 15 stage system clock divider down to 1Hz
- 3 Interrupt requests; 1Hz, 32Hz or 8Hz, Blink
- Prescaler reset (4kHz to 1Hz)
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4-Bit Bi-directional Port B
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All different functions bit-wise selectable
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RAM
EEPROM
- 64 x 4 bit, direct addressable
- 2048 x 16 bits programmable with EM’s
standard MFP programming box
- Direct input read on the port terminals
- Data output latches
- CMOS or Nch. open drain outputs
- Pull-down or pull-up selectable
- Pull-up in Nch. open drain mode
- Selectable PWM, 32kHz, 1kHz and 1Hz output
- Dynamic Input Comparator on PB[0] (SVLD level)
•
Voltage Level Detector
- Default value 2.4V
- Busy flag during measure
- Interrupt request at end of measure
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CPU
- 4 bit RISC architecture
- 2 clock cycles per instruction
- 72 basic instructions
•
Main Operating Modes and Resets
- Active Mode (CPU is running)
- Standby Mode (CPU in halt)
- Sleep Mode (no clock, reset state)
- Initial reset on power on (POR)
- Watchdog reset (logic and oscillation watchdogs)
- Reset with input combination on port A (register
selectable)
•
Liquid Crystal Display Driver
- 8 segments 3 or 4 times multiplexed
- Internal or external voltage multiplier
- Free segment allocation architecture
(metal 2 mask)
- LCD switch off for power save
10-Bit Universal Counter
- 10, 8, 6 or 4 bit up/down counting
- Parallel load
- Event counting (PA[0] or PA[3])
- 8 different input clocks-
- Full 10 bit or limited (8, 6, 4 bit) compare function
- 2 interrupt requests (on compare and on 0)
- Hi-frequency input on PA[3] and PA[0]
- Pulse width modulation (PWM) output
•
(LCD)
Millisecond Counter
- 3 digits binary coded decimal counter (12 bits)
- PA[3] signal pulse width and period measurement
- Internal 1000 Hz clock generation
- Hardware or software controlled start stop mode
- Interrupt request on either 1/10 Sec or 1Sec
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Interrupt Controller
- 5 external and 7 internal interrupt request sources
- Each interrupt request individually maskable
- Each interrupt flag individually resettable
- Automatic reset of each interrupt request register
after read
- General interrupt request to CPU can be disabled
- Automatic enabling of general interrupt request
flag when going into HALT mode
•
4-Bit Input Port A
- Direct input read on the port terminals
- Debouncer function available on all inputs
- Interrupt request on positive or negative edge
- Pull resistor selectable by register
- Test variables (software) for conditional jumps
- PA[0] and PA[3] are inputs for the event counter
- PA[3] is Start/Stop input for the millisecond
counter
- Reset with input combination (register selectable)
©
EM Microelectronic-Marin SA, 9/99, Rev. B/274
2
FOR ENGINEERING ONLY
Table of Contents
Features
Description
Typical Applications
EM6520 at a glance
1
2
Pin Description for EM6520
1.1
Programming Connections
Operating modes
2.1
ACTIVE Mode
2.2
STANDBY Mode
2.3
SLEEP Mode
Power Supply
Reset
4.1
Oscillation Detection Circuit
4.2
Input Port A Reset
4.3
Digital Watchdog Timer Reset
4.4
CPU State after Reset
Oscillator and Prescaler
5.1
Oscillator
5.2
Prescaler
Input and Output ports
6.1
Ports overview
6.2
Port A
6.2.1
6.2.2
6.2.3
6.2.4
IRQ on Port A
Pull-up/down
Software test variables
Port A for 10-Bit Counter and MSC
EM6520
28
28
30
31
32
33
33
34
35
36
36
37
37
39
42
43
44
44
44
45
46
46
46
46
1
1
1
2
4
5
6
6
6
6
7
8
9
9
10
10
11
11
11
13
13
14
14
15
15
15
8.3
8.4
8.5
9
MSC-Modes
Mode selection
Millisecond Counter Registers
Interrupt Controller
9.1
Interrupt control registers
10 Supply Voltage Level Detector
10.1 SVLD Register
11
RAM
12 LCD Driver
12.1 LCD Control
12.2 LCD addressing
12.3 Free segment allocation
12.4 LCD Registers
13
14
15
PERIPHERAL MEMORY MAP
Option Register Memory Map
Active Supply Current test
3
4
5
16 Mask Options
16.1 Input / Output Ports
16.1.1
16.1.2
16.1.3
16.1.4
16.1.5
16.1.6
Port A Metal Options
Port B Metal Options
Voltage Regulator Option
SVLD and Input Comp Level Option
Debouncer frequency Option
User defined LCD Segment allocation
6
6.3
6.4
6.4.1
6.4.2
6.4.3
6.4.4
Port A registers
Port B
Input / Output Mode
Pull-up/Down
CMOS / NCH. Open Drain Output
PWM and Frequency output
15
17
17
18
18
19
17 Measured Electrical Behaviors
17.1 IDD Current
17.2 Regulator Voltage
17.3 Pull Resistors
17.4 Output currents
18 EM6520 Electrical specifications
18.1 Absolute maximum ratings
18.2 Handling Procedures
18.3 Standard Operating Conditions
18.4 DC characteristics - Power Supply
18.5 SVLD and Input Comparator
18.6 Oscillator
18.7 DC characteristics - I/O Pins
18.8 LCD Seg[8:1] Outputs
18.9 LCD Com[4:1] Outputs
18.10
DC Output Component
18.11
LCD voltage multiplier
19
20
Die, Pad Location and Size
TQFP44 Package Dimensions
47
47
47
47
48
49
49
49
49
49
50
50
51
52
52
52
52
53
54
55
55
55
6.5
6.6
7
PB[0] Dynamic Input Comparator
Port B registers
19
20
21
21
22
23
23
23
24
24
10-bit Counter
7.1
Full and Limited Bit Counting
7.2
Frequency Select and Up/Down Counting
7.3
Event Counting
7.4
Compare Function
7.5
Pulse Width Modulation (PWM)
7.5.1
7.5.2
How the PWM Generator works.
PWM Characteristics
7.6
7.7
8
Counter Setup
10-bit Counter Registers
25
25
27
27
27
Millisecond Counter
8.1
PA[3] Input for MSC
8.2
IRQ from MSC
21 Ordering Information
21.1 Packaged devices
21.2 DIE Form
EM Microelectronic-Marin SA cannot assume responsibility for use of any circuitry described other than
circuitry entirely embodied in an EM Microelectronic-Marin SA product. EM Microelectronic-Marin SA reserves
the right to change the circuitry and specifications without notice at any time. You are strongly urged to ensure
that the information given has not been superseded by a more up-to-date version.
©
EM Microelectronic-Marin SA, 9/99, Rev. B/274
3
FOR ENGINEERING ONLY
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
EM6520
Remarks
Not needed if ext. supply
Not needed if ext. supply
Not needed if ext. supply
Not needed if ext. supply
LCD level 1 input, if external supply
selected
LCD level 2 input, if external supply
selected
LCD level 3 input, if external supply
selected
Not used if 3 times multiplex
selected
Pin Description for EM6520
44
DIL
40
QFP
32
Chip
QFP
13
14
15
16
18
19
20
21
25
26
27
28
29
30
31
32
33
35
36
37
38
39
40
41
7
8
9
10
11
12
13
14
17
18
19
20
21
22
23
24
25
27
28
29
30
31
32
33
9
10
11
12
13
14
15
16
17
18
19
nc
20
21
22
23
24
25
26
27
28
29
30
31
Signal Name
C2B
C2A
C1B
C1A
VL1
VL2
VL3
COM[4]
COM[3]
COM[2]
COM[1]
SEG[8]
SEG[7]
SEG[6]
SEG[5]
SEG[4]
SEG[3]
SEG[2]
SEG[1]
Test
PB[0]
PB[1]
PB[2]
PB[3]
Function
Voltage multiplier
Voltage multiplier
Voltage multiplier
Voltage multiplier
Voltage multiplier level 1
Voltage multiplier level 2
Voltage multiplier level 3
LCD back plane 4
LCD back plane 3
LCD back plane 2
LCD back plane 1
LCD segment 8
LCD segment 7
LCD segment 6
LCD segment 5
LCD segment 4
LCD segment 3
LCD segment 2
LCD segment 1
Input test terminal
Internal pull-down 15k
Input/output, open drain
port B terminal 0
Input/output, open drain
port B terminal 1
Input/output, open drain
port B terminal 2
Input/output, open drain
port B terminal 3
Input port A terminal 0
Input port A terminal 1
Input port A terminal 2
Input port A terminal 3
Not bonded for QFP 32
For EM tests only, GND 0 ! except
when needed for MFP programming
Port B data[0] I/O or
dynamic input comparator input
Port B data[1] I/O or
ck[12] output
Port B data[2] I/O or
ck[1] output
Port B data[3] I/O or
PWM output
Testvar 1
Event counter
Testvar 2
Testvar 3
Event counter
MSC start/stop control
MFP Connection
Connect to minimum 100nF,
MFP Connection
32kHz crystal, MFP Connection
32kHz crystal, MFP Connection
Reference terminal, MFP Connection
25
26
27
28
43
1
2
3
35
36
37
38
32
1
2
3
PA[0]
PA[1]
PA[2]
PA[3]
29
30
31
32
33
5
6
8
10
11
39
40
1
3
5
4
5
6
7
8
VBAT=VDD
Vreg
Qout / Osc2
Qin / Osc1
VSS
Positive power supply
Internal voltage regulator
Crystal terminal
Crystal terminal
Negative power supply
Gray shaded areas: terminals needed for MFP programming connections (VDD, VregLogic, Qin, Qout, Test, VSS). See
also Programming Connections.
©
EM Microelectronic-Marin SA, 9/99, Rev. B/274
4
FOR ENGINEERING ONLY
EM6520
Figure 3. Typical configuration
L C D D is p la y
C1
C1
C1
c rys ta l
Q IN
QOUT
a ll C a p a c ito rs 1 0 0 n F
VL1
VL2
VL3
C O M [4 :1 ]
S E G [8 :1 ]
C2
C2
C1A
C1B
C2A
C2B
EM 6520
V D D (V B A T )
V re g
T est
P o rt A
VSS
P o rt B
C3
C4
1.1
Programming Connections
The EM6520 can be programmed using the standard EM MFP programming box for 4 bit uControllers. The
interface signals are listed in the table below. The circuit can be programmed on the programming box or
directly on the PCB . For more information please refer to the MFP programmer’s manual.
Chip
QFP
44
DIL
40
QFP
32
20
29
30
31
32
33
37
5
6
8
10
11
29
39
40
1
3
5
27
4
5
6
7
8
Signal Name
Test
VBAT=VDD
Vreg
Qout / Osc2
Qin / Osc1
VSS
Function
Input test terminal
Internal pull-down 15k
Positive power supply
Internal voltage regulator
Crystal terminal
Crystal terminal
Negative power supply
Remarks
Usually 1 in MFP mode, 0 resets the
MFP interface
MFP Power Connection
MFP power Connection, adapts the
Oscillator voltage to VBAT
MFP Serial Data Input / Output
MFP serial Clock Input
MFP Connection, Reference terminal
©
EM Microelectronic-Marin SA, 9/99, Rev. B/274
5
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