Sharp XE-A40S

XE-A40S
4 – 4
POWER SUPPLY/CONTROL TERMINAL
[5] KEY-DISPLAY
1. LCD CONTROL
1.1. LCD CONTROL
LCD-related registers
1.1.1 LCD Control Signal / Key Strobe Signal
1.1.2 Data Latch Signal
L : LCD write data latch
2. KEY/DISPLAY SCAN
On the XE-A40S, the key and display scan signal is common.
KEY/DISPLAY SCAN and key read should be performed at the follow-
ing timing.
1) KEY/DISPLAY SCAN cycle: 10ms
2) Blanking time: 50us
3) KEY DATA READ timing: More than 10 ms from the fall of the
SCAN signal
Key / Display-related registers
2.1. LED Segment Signal
2.2. Key Strobe Signal
Bit3 ~ 0 : KS3 ~ 0
Strobe signals for keys and POP UP Display are generated at KS3 - 0.
2.3. Key Return Signal
P107 89 O P107 LATCH L IN PRINTER LATCH SIGNAL
PORT PIN No. I/O Pin name Function
BYTE 8 I BYTE Connected to VCC
CNVss 9 I CNVss Connected to GND
/RESET 12 I /RESET
Xout 13 O Xout Connected to XTAL
Vss 14 Vss Connected to GND
Xin 15 I Xin Connected to XTAL
Vcc 16 Vcc Connected to VCC
Vcc 62 Vcc Connected to VCC
Vss 64 Vss Connected to GND
Avss 96 AVss Connected to GND
Vref 98 Vref Connected to VCC
Avcc 99 Avcc Connected to VCC
PORT PIN No. I/O Pin name Signal name Initial
value
OFF
MODE
Function
Function Address R/W
LCD Write Data 04001h W
LCD Read Data 04002h R
LCD Control Signal 04003h W
Data Latch Signal CPU port P94 W
Address Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
04003h – E R/W RS – – – –
Bit7 : Not used
Bit6 : E
Enable Signal Enable
Bit5 : R/W
H : Data read L : Data Write
Bit4 : RS
H : Data input L : Instruction Input
Function Address R/W
LED Segment Signal 04000h W
Key Strobe Signal 04003h W
Key Return Signal CPU port R
Address Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
04000h dp g f e d c b a
Address Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
04003h – – – – KS3 KS2 KS1 KS0
PIN
No.
CPU
PORT
Signal
name
Function
38 P60 KR0# KEY RETURN SIGNAL 0
37 P61 KR1# KEY RETURN SIGNAL 1
36 P62 KR2# KEY RETURN SIGNAL 2
35 P63 KR3# KEY RETURN SIGNAL 3
34 P64 KR4# KEY RETURN SIGNAL 4
33 P65 KR5# KEY RETURN SIGNAL 5
32 P66 KR6# KEY RETURN SIGNAL 6
31 P67 KR7# KEY RETURN SIGNAL 7