Cmsemicon SC8F577 Series - Page 44

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SC8F577x
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Data Bus
Write
WPUA
Read
WPUA
Write
PORTA
Write
TRISA
Read
TRISA
Read
PORTA
Weak
pull-up
VDD
I/O pin
VSS
D Q
CK
Q
D Q
CK
Q
D Q
CK
Q
VDD
Write
IOCA
D Q
CK
Q
Read
IOCA
Interrupt-
on-change
Q D
EN
Q D
EN
Analog
input mode
（1）
Analog
input mode
（1）
Q3
Read
PORTA
D Q
CK
Q
Write
WPDA
To A/D converter
Fig 6-1: I/O port structure (1)