CHAPTER 4 PORT FUNCTIONS
User’s Manual U15331EJ4V1UD 85
Figure 4-10. Block Diagram of P34
(a) When
µ
PD789488, 78F9488 is used
P34
WRPUB3
RD
WRPORT
WRPM
PUB34
PM34
VDD
P-ch
Internal bus
Selector
Output latch
(P34)
(b) When
µ
PD789489, 78F9489 is used
P34/RIN
WRPUB3
RD
WRPORT
WRPM
PUB34
PM34
VDD
P-ch
Internal bus
Selector
Output latch
(P34)
Alternate
function
PUB3: Pull-up resistor option register B3
PM: Port mode register
RD: Port 3 read signal
WR: Port 3 write signal