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Syntek Semiconductor Co., Ltd
STK55C641
STK55C641 Specification
1. FEATURES :
* Operating voltage : 2.5V - 6V.
* Maximum CPU operating frequency : 4MHz at 5V and 1.5MHz at 2.5V
* Dual oscillators :
- 32.768 KHz crystal oscillator for LCD display and watch timer.
- RC oscillator for system clock.
* 40 segments and 16 commons output for LCD driver.
- 1/5 bias, 1/16 duty and 64Hz frame frequency.
- 1/4 bias, 1/8 duty and 128Hz frame frequency.
* I/O port.
- 30 I/O pins.
- Port 1 with selectable interrupt.
* Built in 2K bytes RAM (including LCD storage area).
* Built in 8K bytes ROM for program.
* One 8-bit timer with 8 predefined input clock.
* Five interrupt sources :
NMI - 64 Hz interrupt
IRQ1 - Stopwatch timer interrupt
IRQ2 - Fix-time timer interrupt
IRQ3 - Timer interrupt
IRQ4 - External interrupt
* Code option :
- Built-in 150K OHM pull-up resistors for I/O port.
- 1/8 duty or 1/16 duty.
2. APPLICATION :
* Data bank
* Calculator
* Hand-held game
* Small instrument
* Toy
LCD Controller 1 / 1 ISSUE DATE : 3 March, 2000
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Syntek Semiconductor Co., Ltd
STK55C641
decoder
SOUND
32768Hz
C1-C16
S1-S40
3. BLOCK DIAGRAM:
OSC1 OSC2
RC
oscillator
ROM
8Kx8
RAM
2Kx8
Address
8-bit CPU
A0-A15 IRQ
D0-D7
Clock
Generator
LCD driver
8-bit Timer
Port 1 Port 2 Port 3 Port 4
P10-P17 P20-P27 P30-P37 P40-P45
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Syntek Semiconductor Co., Ltd
STK55C641
4. PIN DESCRIPTION : (Total 100 pads)
Pin name I/O Function description
COM1-COM16 O LCD common output pins
SEG1...SEG40 O LCD segment output pins
VLCD I LCD voltage input
VR I LCD contrast control
CLK256 O 256 Hz clock output
P10-P17 I/O 8-bit I/O pins for port 1
P20-P27 I/O 8-bit I/O pins for port 2
P30-P37 I/O 8-bit I/O pins for port 3
P40-P45 I/O 6-bit I/O pins for port 4
OSC1 I Main system oscillator input pin for chip
OSC2 O Main system oscillator output pin for resistor
XOSC1 I 32.768K Hz crystal oscillator input
XOSC2 O 32.768K Hz crystal oscillator output
SOUND O Audio output
/RES I System reset
/TEST I Test pin. Keep floating or connect to Vdd
VDD Power input
VSS1, VSS2 Signal ground
5. ADDRESS ARRANGEMENT
Please note that A14-A15 are not cared in hardware. So, following memory areas are mapping
in the same location.
0000-3FFF, 4000-7FFF, 8000-BFFF, C000-FFFF.
1) RAM
0000-007F for LCD output data storage.
Memory address Pin for 1/16 duty Pin for 1/8 duty
0000-0004 COM1 COM1
0008-000C COM2 COM2
0010-0014 COM3 COM3
0018-001C COM4 COM4
0020-0024 COM5 COM5
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Syntek Semiconductor Co., Ltd
STK55C641
Memory address Pin for 1/16 duty Pin for 1/8 duty
0028-002C COM6 COM6
0030-0034 COM7 COM7
0038-003C COM8 COM16
0040-0044 COM9
0048-004C COM10
0050-0054 COM11
0058-005C COM12
0060-0064 COM13
0068-006C COM14
0070-0074 COM15
0078-007C COM16
The LSB of low byte - SEG1.
The MSB of high byte - SEG40.
The middle bits are in the order.
0080-00FF for zero page area.
0100-01FF for stack and data page area.
0200-07FF for data area.
2) ROM
E000-FFFF for program area.
FFFF, FFFE - IRQ vector.
FFFD, FFFC - RES vector.
FFFB, FFFA - NMI vector.
3) Others
1000 To enter stand-by mode. Write only.
* Write this address, the CPU will be hold with LCD state no change.
* When in stand-by mode, the NMI and IRQ will wake up the CPU.
| 1001 To enter sleep mode. Write only.
= 1 Sleep mode 1
= 2 Sleep mode 2
All other values are prohibited. Do not write any other value to this register.
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Syntek Semiconductor Co., Ltd
STK55C641
In sleep mode 1, both of the main system oscillator and 32.768KHz sub-system
oscillator will be stopped. So, all function are stopped and only external interrupt can
wake up this chip. The LCD display will be turn off while getting into sleep mode 1.
In sleep mode 2, only main system oscillator will be stopped. So, the following
functions will still keep working.
* The LCD will be kept on.
* The watch timer and fix-time timer will keep going.
* The NMI, port 1, watch timer and fix-time timer interrupt will wake up this chip.
* CPU will keep working if clock source is 32.768K Hz.
1002 Watch timer control register. Write only.
Bit 0 : = 0 Set watch timer interrupt at 10 Hz
= 1 Set watch timer interrupt at 100 Hz
1 : = 0 Set fix-time timer interrupt at 2 Hz
= 1 Set fix-time timer interrupt at 1 Hz
2 : = 0 Normal operation.
= 1 Reset and stop stopwatch timer.
3 : = 0 Stop stopwatch register without reset.
= 1 Start stopwatch timer.
4 : = 0 CPU clock is system clock.
= 1 CPU clock is 32.768K Hz.
7-5 : Reserved.
The default value for each bit is zero. Bit 2 will be cleared to zero automatically after
stopwatch timer reset.
1003 IRQ flag register. Read & write.
Read function :
Bit 0 : = 1 Stopwatch timer interrupt, IRQ1.
1 : = 1 Fix-time timer interrupt, IRQ2.
2 : = 1 Timer interrupt, IRQ3.
3 : = 1 External interrupt, IRQ4.
Write function :
Bit 0 : = 0 Clear stopwatch timer interrupt.
1 : = 0 Clear fix-time timer interrupt.
2 : = 0 Clear timer interrupt.
3 : = 0 Clear external interrupt.
Note : Please do not use the STZ $1003 to clear all the interrupts at the same time.
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Syntek Semiconductor Co., Ltd
STK55C641
Also, please do not use the read-modify-write instruction to clear interrupt flag.
For example, LDA #1 and TRB $1003 to clear the IRQ1. Because some
other interrupts may be lost if clear interrupt with above method. Following
procedures are suggested.
LDA $1003
AND #1
BEQ CheckIRQ2
EOR #$0FF
STA $1003 ;clear IRQ1
·
·
·
1004 Port 1 data. Read & write.
1005 Set port 1 bit function. Write only.
* An '1' in this register will set the corresponding pin of port 1 as an output pin.
* The default value for each bit is zero. A pull-up resistor can be added to the pin by
code option. But the pull-up resistor will be disabled if the output state is low.
1006 Port 2 data. Read & write.
1007 Set port 2 bit function. Write only.
* An '1' in this register will set the corresponding pin of port 2 as an output pin.
* The default value for each bit is zero. A pull-up resistor can be added to the pin by
code option. But the pull-up resistor will be disabled if the output state is low.
1008 Port 3 data. Read & write.
1009 Set port 3 bit function. Write only.
* An '1' in this register will set the corresponding pin of port 3 as an output pin.
* The default value for each bit is zero. A pull-up resistor can be added to the pin by
code option. But the pull-up resistor will be disabled if the output state is low.
100A Port 4 data. Read & write.
100B Set port 4 bit function. Write only.
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Syntek Semiconductor Co., Ltd
STK55C641
* An '1' in this register will set the corresponding pin of port 4 as an output pin.
* The default value for each bit is zero. A pull-up resistor can be added to the pin by
code option. But the pull-up resistor will be disabled if the output state is low.
100C Set port 1 bit interrupt function. Write only.
* An '1' in this register will set the interrupt function of the corresponding pin of port 1
to be enable. That is, an interrupt will be generated if a low level is detected in the
pin.
* The default value for each bit is zero.
100D Timer 1 data. Read & write.
* Before writing $100D, the program should select timer clock ($100E) first.
* After timer 1 been enabled, the timer will start to count down. When timer counts to
zero, the timer will count from the initial value and IRQ3 will happen.
* The time elapse = ($100D)/timer clock
100E Timer 1 clock select. Write only.
Bit 2-0 : = 000 System clock/2
= 001 System clock/4
= 010 System clock/8
= 011 System clock/16
= 100 System clock/32
= 101 System clock/64
= 110 System clock/128
= 111 System clock/256
7-3 : Reserved
The default value is unknown.
100F Control register. Write only.
Bit 0 : = 0 Disable timer 1 output to SOUND pin.
= 1 Enable timer 1 output to SOUND pin.
1 : = 0 Disable timer 1 interrupt.
= 1 Enable timer 1 interrupt.
2 : = 0 Disable NMI.
= 1 Enable NMI.
3 : = 0 Disable timer 1.
= 1 Enable timer 1.
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Syntek Semiconductor Co., Ltd
STK55C641
4 : = 0 LCD off.
= 1 LCD on.
5 : = 0 Disable watch timer interrupt.
= 1 Enable watch timer interrupt.
6 : = 0 Disable fix-time timer interrupt.
= 1 Enable fix-time timer interrupt.
7 : = 0 Disable sound output.
= 1 Enable sound output.
* The default value for each bit is zero.
Timer 1 output
Bit 0 of $100F
Bit 7 of $100F
1010 Stopwatch timer value. Read only.
Bit 3-0 : 1/100 sec data in BCD value.
7-4 : 1/10 sec data in BCD value.
4) The reset status of CPU
If the /RES is keep low more than two system clocks, then the CPU will be reset. After reset,
the interrupt mask flag is set, the decimal mode is cleared and the program counter will be
loaded with the reset vector from address $FFFC and $FFFD. So, after initial procedure the
firmware should do a ‘CLI’ instruction. Otherwise, the CPU will not acknowledge any
interrupt.
1/2
NAND
AND
SOUND
5) Interrupt Sources
* There are five interrupt sources :
NMI - 64 Hz interrupt.
IRQ1 - Stopwatch timer interrupt.
IRQ2 - Fix-time timer interrupt.
IRQ3 - Timer interrupt.
IRQ4 - Port 1 interrupt.
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Syntek Semiconductor Co., Ltd
STK55C641
V
* The interrupt function of CPU is disabled after reset. A CLI instruction must be added after
initialize this chip otherwise the CPU will not acknowledge any IRQ.
* All interrupts will wake up CPU from standby mode.
* NMI, IRQ1, IRQ2 and IRQ4 will wake up CPU from sleep mode 2.
* Only IRQ4 will wake up CPU from sleep mode 1.
* If want to accept IRQ in the middle of NMI loop, please reset the IRQ disable flag of the
CPU before IRQ signal come.
* When port 1 is in input mode and pin interrupt enable, a low signal from pin will generate
IRQ4.
6. ABSOLUTE MAXIMUM RATINGS
Operating temperature ........................................................................ 0 to 70 ℃
Storage temperature ...................................................................... -65 to 150 ℃
Supply voltage ............................................................................................... 7 V
Input voltage ........................................................................... -0.6 to Vdd+0.6 V
7. ELECTRICAL CHARACTERISTIC :
Parameter Symbol Condition Min Typ. Max Unit
Supply Voltage Vdd 2.5 3.0 6
Main system frequency ∅sys Vdd=2.5V - 1 1.5 Mhz
Vdd=2.7V 2 Mhz
Vdd=3V 2.5 Mhz
Vdd=3.5V 3 Mhz
Vdd=4V 3.5 Mhz
Vdd>=4.5V 4 Mhz
Crystal frequency ∅cry 32768 Hz
Operating current Idd Vdd=5V,∅sys=1Mhz 1 mA
Standby current Istdby Vdd=5V,∅sys=1Mhz .8 mA
Sleep mode 1 current Islp1 Vdd=5V, LCD off 1 µA
Sleep mode2 current Islp2 Vdd=2.5V,Vlcd=4V 40 µA
(LCD on) Vdd=3V, Vlcd=5V 60 µA
Vdd=3.5V, Vlcd=6V 80 µA
Vdd=Vlcd=2.5V 16 µA
Vdd=Vlcd=3V 25 µA
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Syntek Semiconductor Co., Ltd
STK55C641
V
V
V
V
V
V
Parameter Symbol Condition Min Typ. Max Unit
Vdd=Vlcd=3.5V 35 µA
Vdd=Vlcd=4V 45 µA
Vdd=Vlcd=4.5V 70 µA
Vdd=Vlcd=5V 75 µA
Sleep mode2 current Vdd=2.5V 2 µA
(LCD off) Vdd=3V 3 µA
Vdd=3.5V 5 µA
Vdd=4V 6 µA
Vdd=4.5V 7 µA
Vdd=5V 9 µA
Input high voltage Vih Vdd=5.0V 2.0
Input low voltage Vil Vdd=5.0V -0.6 0.8
Input high leakage current Iih Vih=Vdd -1 µA
Input low leakage current Iil Vil=0 1 µA
Output high voltage
(For SEGx and COMx)
Output low voltage
(for SEGx and COMx)
Output high voltage
(for other pins)
Output low voltage
(for other pins)
Voh1 Ioh=-30µA Vlcd-
0.2
Vol1 Iol=40µA 0 0.2
Voh2 Ioh=-2mA Vdd-
0.4
Vol2 Iol=2mA 0 0.4
Vlcd
Vdd
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Syntek Semiconductor Co., Ltd
STK55C641
8. LCD WAVEFORM :
8.1 1/16 duty
1/64 sec
Vlcd
4/5 Vlcd
3/5 Vlcd
COM1 2/5 Vlcd
1/5 Vlcd
Vss
Vlcd
4/5 Vlcd
3/5 Vlcd
COM2 2/5 Vlcd
1/5 Vlcd
Vss
Vlcd
4/5 Vlcd
3/5 Vlcd
COM3 2/5 Vlcd
1/5 Vlcd
Vss
•
•
•
Vlcd
4/5 Vlcd
3/5 Vlcd
COM16 2/5 Vlcd
1/5 Vlcd
Vss
Vlcd
4/5 Vlcd
3/5 Vlcd
SEGx 2/5 Vlcd
1/5 Vlcd
Vss
There are two LCD matrix DOTs active at (SEGx,COM2) and (SEGx,COM16)
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Syntek Semiconductor Co., Ltd
STK55C641
8.2 1/8 duty
1/128 sec
COM1
Vlcd
3/4 Vlcd
2/4 Vlcd
COM2 1/4 Vlcd
Vss
Vlcd
3/4 Vlcd
2/4 Vlcd
COM3 1/4 Vlcd
Vss
Vlcd
3/4 Vlcd
2/4 Vlcd
COM4 1/4 Vlcd
Vss
•
•
•
Vlcd
3/4 Vlcd
COM8 2/4 Vlcd
1/4 Vlcd
Vss
Vlcd
3/4 Vlcd
SEGx 2/4 Vlcd
1/4 Vlcd
Vss
There are two LCD matrix DOTs active at (SEGx,COM2) and (SEGx,COM8)
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Syntek Semiconductor Co., Ltd
STK55C641
9. PAD LOCATION :
Chip size : 3090 x 3280 Unit : µM
PAD-No Name X Y PAD-No Name X Y
1 VSS 69.94 459.36 51 S34 3020.06 2735.10
2 C1 69.94 344.68 52 S35 3020.06 2849.78
3 C2 69.94 230.00 53 S36 3020.06 2971.98
4 C3 133.12 70.94 54 S37 3020.06 3094.18
5 C4 247.80 70.94 55 S38 2864.38 3209.06
6 C5 362.48 70.94 56 S39 2723.57 3209.06
7 C6 477.16 70.94 57 S40 2601.37 3209.06
8 C7 591.84 70.94 58 VLCD 2481.05 3209.06
9 C8 706.52 70.94 59 VR 2363.55 3209.06
10 C9 821.20 70.94 60 CLKOUT 2246.05 3209.06
11 C10 935.88 70.94 61 TESTB 2131.37 3209.06
12 C11 1050.56 70.94 62 XOSC1 2016.69 3209.06
13 C12 1165.24 70.94 63 XOSC2 1902.01 3209.06
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Syntek Semiconductor Co., Ltd
STK55C641
PAD-No Name X Y PAD-No Name X Y
14 C13 1279.92 70.94 64 VDD 1787.33 3209.06
15 C14 1394.60 70.94 65 OSC1 1672.65 3209.06
16 C15 1509.28 70.94 66 OSC2 1557.97 3209.06
17 C16 1623.96 70.94 67 VSS 1443.29 3209.06
18 S1 1738.64 70.94 68 VDD 1328.61 3209.06
19 S2 1853.32 70.94 69 RESB 1213.93 3209.06
20 S3 1968.00 70.94 70 SOUND 1099.25 3209.06
21 S4 2082.68 70.94 71 P10 984.57 3209.06
22 S5 2197.36 70.94 72 P11 869.89 3209.06
23 S6 2312.04 70.94 73 P12 755.21 3209.06
24 S7 2426.72 70.94 74 P13 640.53 3209.06
25 S8 2541.40 70.94 75 P14 525.85 3209.06
26 S9 2656.08 70.94 76 P15 387.67 3209.06
27 S10 2770.76 70.94 77 P16 249.49 3209.06
28 S11 2885.44 70.94 78 P17 69.94 3097.00
29 S12 3020.06 206.50 79 P20 69.94 2982.32
30 S13 3020.06 324.00 80 P21 69.94 2867.64
31 S14 3020.06 441.50 81 P22 69.94 2752.96
32 S15 3020.06 556.18 82 P23 69.94 2638.28
33 S16 3020.06 670.86 83 P24 69.94 2523.60
34 S17 3020.06 785.54 84 P25 69.94 2408.92
35 S18 3020.06 900.22 85 P26 69.94 2294.24
36 S19 3020.06 1014.90 86 P27 69.94 2179.56
37 S20 3020.06 1129.58 87 P30 69.94 2064.88
38 S21 3020.06 1244.26 88 P31 69.94 1950.20
39 S22 3020.06 1358.94 89 P32 69.94 1835.52
40 S23 3020.06 1473.62 90 P33 69.94 1720.84
41 S24 3020.06 1588.30 91 P34 69.94 1606.16
42 S25 3020.06 1702.98 92 P35 69.94 1491.48
43 S26 3020.06 1817.66 93 P36 69.94 1376.80
44 S27 3020.06 1932.34 94 P37 69.94 1262.12
45 S28 3020.06 2047.02 95 P40 69.94 1147.44
46 S29 3020.06 2161.70 96 P41 69.94 1032.76
47 S30 3020.06 2276.38 97 P42 69.94 918.08
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Syntek Semiconductor Co., Ltd
STK55C641
PAD-No Name X Y PAD-No Name X Y
48 S31 3020.06 2391.06 98 P43 69.94 803.40
49 S32 3020.06 2505.74 99 P44 69.94 688.72
50 S33 3020.06 2620.42 100 P45 69.94 574.04
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Syntek Semiconductor Co., Ltd.
STK55C641
10. APPLICATION CIRCUIT :
10.1 For 5V LCD panel :
10.2 For 3V LCD panel :
LCD Controller 16 / 16 ISSUE DATE : 3 March, 2000
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Syntek Semiconductor Co., Ltd.
STK55C641
LCD Controller 17 / 17 ISSUE DATE : 3 March, 2000
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Syntek Semiconductor Co., Ltd.
STK55C641
Syntek Semiconductor Co., Ltd.
Customer Information Sheet for STK55C641 000112
1. Customer's Name : ____________________
2. Project title : _________________________
* 3. Syntek part number : ___________________
4. Package --------------- ( ) Chip ( ) QFP
5. Options :
Oscillator type ---- ( ) RC ( ) XTAL
LCD duty----------- ( ) 1/8 duty, 1/4 bias ( ) 1/16 duty, 1/5 bias
P o r t 1 P o r t 2 P o r t 3 P o r t 4
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 5 4 3 2 1 0
Pull-up
6. Customer code :
Code form ----------------- ( ) EPROM ( ) file _______________
Checksum ----------------- E000-EFFF __________H
F000-FFFF __________H
E000-FFFF __________H
7. Operating conditions :
All the operating conditions listed below are for Syntek reference. Syntek will not
guaranty on these values. Please refer to data book or contact Syntek for the guaranty
values.
Operating voltage : _____-_____ V Voltage doubler : ( ) Yes ( ) No
Operating current : _____ mA Operating frequency : _____ Hz
Sleep current :
Mode 1: _____ µA (LCD Off)
Mode 2 : _____ µA (For LCD On) _____ µA (For LCD Off)
LCD Controller 18 / 18 ISSUE DATE : 3 March, 2000
Others :
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Syntek Semiconductor Co., Ltd.
STK55C641
Customer : __________________ Salesman : __________________Date : __/__/__
Note : The items marked with '*' will be filled by Syntek.
LCD Controller 19 / 19 ISSUE DATE : 3 March, 2000
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