CHAPTER 4 PORT FUNCTIONS
User’s Manual U16898EJ3V0UD
59
Figure 4-11. Block Diagram of P123
P123
WR
PU
RD
WR
PORT
WR
PM
PU123
Output latch
(P123)
PM123
V
DD
P-ch
PM12
PU12
Internal bus
Selector
P12
P12:
Port register 12
PU12: Pull-up resistor option register 12
PM12: Port mode register 12
RD:
Read signal
WR
××
: Write signal