Code : Difference of 38C2 Group

Page : 6 of 12

Rev. 1.00 Date : Sep.8, 2003

Type A : If data is read from a pin set to output,

the value of the function output except I/O port is read.

Type B : If data is read from a pin set to output,

the value of the port latch is read.

3. Circuit structure of I/O port

Type A

Type B

Type B

Type A

Type A

Type B

Type A

Type A

Standard

version

Type B

Type B

A version

Type A

Type B

Direction register

Port latch

Data bus

PXi

Output selection

Function output except I/O port

Data bus

PXi

Output selection

Function output except I/O port

Direction register

Port latch