
RL78/G13
CHAPTER 4 PORT FUNCTIONS
R01UH0146EJ0100 Rev.1.00
219
Sep 22, 2011
For example, figures 4-39 to 4-41 show block diagrams of port 8 for 128-pin products when PIOR = 00H.
Figure 4-39. Block Diagram of P80, P81
P80, P81
WRPU
RD
WRPORT
PU80, PU81
EVDD
P-ch
PU8
P8
WRPM
PM8
POM80, POM81
POM8
WRPOM
PM80, PM81
CMOS
TTL
PIM8
PIM80, PIM81
WRPIM
Output latch
(P80, P81)
Selector
Internal
bus
P8:
Port register 8
PU8:
Pull-up resistor option register 8
PM8:
Port mode register 8
PIM8:
Port input mode register 8
POM8: Port output mode register 8
RD:
Read signal
WR
××: Write signal
<R>