Sharp XE-A301 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
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
04001h
04002h
04003h
CPU port P94
Bit4 Bit3 Bit2
RS KS3 KS2
Enable
PIN
PORT
No.
Vcc
Vss
AVss
Vref
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.
R/W
1 KEY/display SCAN cycle: 10ms
W
2 Blanking time: 50us
R
3 KEY DATA READ timing: More than 10 ms from the fall of the SCAN
W
signal
W
Key / Display-related registers
Bit1 Bit0
LED Segment Signal
KS1 KS0
LCD Control Signal / Key Strobe Signal
Key Return Signal
< LED Segment Signal >
Address
04000h
< LCD Control Signal / Key Strobe Signal >
Address
04003h
Bit3 ~ 0 : KS3 ~ 0
Strobe signals for keys and POP UP Display are generated at KS3 - 0.
< Key Return Signal >
Address
04003h
XE-A301V HARDWARE DESCRIPTION
– 8 –
I/O Pin name
62 Vcc Connected to VCC
64 Vss connected to GND
96 AVss Connected to GND
98 Vref Connected to VCC
99 AVcc Connected to VCC
Function
Bit7 Bit6 Bit5 Bit4
dp g f e
Bit7 Bit6 Bit5 Bit4
- E R/W RS
Bit7 Bit6 Bit5 Bit4
KR7 KR6 KR5 KR4
Function
Address R/W
04000h W
04003h W
04003h R
Bit3 Bit2 Bit1 Bit0
d c b a
Bit3 Bit2 Bit1 Bit0
KS3 KS2 KS1 KS0
Bit3 Bit2 Bit1 Bit0
KR3 KR2 KR1 KR0