Sharp XE-A402 Service Manual page 9

Power supply/CONTROL pins
PIN
PORT I/O Pin name
No.
BYTE 8 I BYTE
CNVss 9 I CNVss
/RESET 12 I /RESET
Xout 13 O Xout
Vss 14 Vss
Xin 15 I Xin
Vcc 16 Vcc
5. KEY-DISPLAY
5-1. LCD CONTROL
Basically the same as the ER-A275P.
LCD-related registers
Function
LCD Write Data
LCD Read Data
LCD Control Signal / Key Strobe Signal
Data Latch Signal
< LCD Control Signal / Key Strobe Signal >
Address Bit7 Bit6 Bit5
04003h – E R/W
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
< Data Latch Signal >
L : LCD write data latch
Function
Connected to VCC
Connected to GND
OPEN
Connected to GND
connected to Spectram diffusion IC
Connected to VCC
Address R/W
04001h W
04002h R
04003h W
CPU port P94 W
Bit4 Bit3 Bit2 Bit1 Bit0
RS KS3 KS2 KS1 KS0
XE-A402 HARDWARE DESCRIPTION
PIN
PORT I/O Pin name
No.
Vcc 62 Vcc
Vss 64 Vss
AVss 96 AVss
Vref 98 Vref
AVcc 99 AVcc
5-2. KEY/DISPLAY SCAN
On the A401, the key and display scan signal is common.
KEY/display SCAN and key read should be performed at the following
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
Function
LED Segment Signal
LCD Control Signal / Key Strobe Signal
Key Return Signal
< LED Segment Signal >
Address Bit7 Bit6
04000h dp g
< LCD Control Signal / Key Strobe Signal >
Address Bit7 Bit6
04003h - E
Bit3 ~ 0 : KS3 ~ 0
Strobe signals for keys and POP UP Display are generated at KS3 - 0.
< Key Return Signal >
Address Bit7 Bit6
04003h KR7 KR6
– 8 –
PC-UM10M
Function
Connected to VCC
connected to GND
Connected to GND
Connected to VCC
Connected to VCC
Address
04000h
04003h
04003h
Bit5 Bit4 Bit3 Bit2 Bit1
f e d c b
Bit5 Bit4 Bit3 Bit2 Bit1
R/W RS KS3 KS2 KS1
Bit5 Bit4 Bit3 Bit2 Bit1
KR5 KR4 KR3 KR2 KR1
R/W
W
W
R
Bit0
a
Bit0
KS0
Bit0
KR0