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Chapter 5 Port Functions
5
Fig. 5-11 Block Diagram of P31, and P34 through P37 (Port 3)
Internal bus
RD
PUO
WR
PUO
WR
PM3n
Port 3 mode register
PM3n
WR
PMC3n
PMC3n
WR
P3n
P3n
RD
PMC3n
RD
P3n
Pull-up resistor option register
PUO3
P3n
n = 1, 4, 5, 6, 7
V
DD
TO, TxD output
RD
P3n
Selector
Output latch
