sh6611a SinoWealth Micro-Electronics Corp. Ltd, sh6611a Datasheet - Page 7

• Manufacturer Part Number: sh6611a
• Description: 1k 4-bit Microcontroller With Lcd Driver
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

6. I/O Port
SH6611A has 16 CMOS quasi-I/O ports, PORTA, PORTB, PORTC, PORTD. All I/O ports are bit programmable.
If PORTA,B,C,D are pull-high internally, it is weak drive.
The equivalent circuit is below:
Port I/O Data Register: (PDR)
Address
$0A
$0B
$08
$09
PORT A.3
PORT B.3
PORT C.3
PORT D.3
Bit3
Data-Out
Data-In
PORT A.2
PORT B.2
PORT C.2
PORT D.2
Bit2
7/25
I/O PAD
PORT C.1
PORT D.1
PORT A.1
PORT B.1
Bit1
PORT C.0
PORT D.0
PORT A.0
PORT B.0
SH6611A
Bit0
Ver 0.0