NEC PD78214 - Manual (Page 98)

69
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