MDT2020FF Datasheet, PDF (13/16 Pages) Micon Design Technology Corporation – 8-bit micro-controller

10. Port A ,Port B and Port C Equivalent Circuit
MDT2020(FF)
Working Register
Data I/P
D
QB
I/O
Control
I/O Control
Latch
CK
Q
Write
D
Data O/P
Latch
CK
Q
Port I/O Pin
Data Bus
Read
QB
D
Data I/P
Latch
CK
TTL Input Level
Input Resistor
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P. 12
2007/8 VER 1.5