
CHAPTER 4 PORT FUNCTIONS
User’s Manual U15905EJ2V1UD
103
(3) Block diagram
Figure 4-5. Block Diagram of P20
Internal
bus
WRPMC
RD
Address
SI4 input
WRPORT
P20/SI4
PMC20
Output latch
(P20)
Selector
WRPU
PU20
WRPM
PM20
PMC2
P2
PU2
PM2
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
P2:
Port register 2
PM2:
Port mode register 2
PMC2: Port mode control register 2
PU2:
Pull-up resistor option register 2