
CHAPTER 4 PORT FUNCTIONS
User’s Manual U15905EJ2V1UD
110
(3) Block diagram
Figure 4-8. Block Diagram of P30
Internal
bus
WRPMC
RD
Address
SI1 input
RXD0 input
WRPORT
P30/SI1/RXD0
PMC30
Output latch
(P30)
Selector
WRPU
PU30
WRPM
PM30
WRPFC
PFC30
PMC3
P3
PU3
PM3
PFC3
EVDD
P-ch
Caution
This pin does not have hysteresis characteristics in the port mode.
It has hysteresis characteristics only when an input-pin alternate function is used.
Remark
P3:
Port register 3
PM3:
Port mode register 3
PMC3: Port mode control register 3
PFC3: Port function control register 3
PU3:
Pull-up resistor option register 3