NEC uPD78P078 - Manual (Page 147)

147
CHAPTER 6 PORT FUNCTIONS
Figure 6-13. Block Diagram of P60 to P63
PM : Port mode register
RD : Port 6 read signal
WR : Port 6 write signal
Figure 6-14. Block Diagram of P64 to P67
PUO : Pull-up resistor option register
PM : Port mode register
RD : Port 6 read signal
WR : Port 6 write signal
WR
PM
WR PORT
RD
V
DD
Selector
Output Latch
(P60 to P63)
PM60 to PM63
Internal bus
P60 to P63
Mask Option Resistor
Mask ROM versions
only. PD78P078
and 78P078Y have
no pull-up resistor.
µ
P-ch
WR
PM
WR PORT
RD
WR
PUO
V DD
Selector
PUO6
Output Latch
(P64 to P67)
PM64 to PM67
Internal bus
P64/RD,
P65/WR,
P66/WAIT,
P67/ASTB