
CHAPTER 4 PORT FUNCTIONS
User’s Manual U15905EJ2V1UD
104
Figure 4-6. Block Diagram of P21
Internal
bus
WRPMC
RD
Address
SO4 output
WRPORT
P21/SO4
PMC21
Selector
WRPU
PU21
WRPM
PM21
Output latch
(P21)
WRPF
PF21
PMC2
PU2
PM2
P2
PF2
EVDD
P-ch
EVDD
EVSS
P-ch
N-ch
Remark
P2:
Port register 2
PM2:
Port mode register 2
PMC2: Port mode control register 2
PU2:
Pull-up resistor option register 2