Cmsemicon SC8F577 Series - Page 45

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SC8F577x
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Data Bus
Write
WPUB
Read
WPUB
Write
PORTB
Write
TRISB
Read
TRISB
Read
PORTB
Weak
pull-up
VDD
I/O pin
VSS
D Q
CK
Q
D Q
CK
Q
D Q
CK
Q
VDD
Write
IOCB
D Q
CK
Q
Read
IOCB
Interrupt-
on-change
Q D
EN
Q D
EN
Analog
input mode
（1）
Analog
input mode
（1）
Q3
Read
PORTB
D Q
CK
Q
Write
WPDB
To A/D converter
Fig 6-2: I/O port structure (2)