CHAPTER 4 PORT FUNCTIONS
User’s Manual U16898EJ3V0UD
54
Figure 4-6. Block Diagram of P40 and P45
P40, P45
WR
PU
RD
WR
PORT
WR
PM
PU40, PU45
Output latch
(P40, P45)
PM40, PM45
V
DD
P-ch
PU4
PM4
Internal bus
Selector
P4
P4:
Port register 4
PU4:
Pull-up resistor option register 4
PM4: Port mode register 4
RD:
Read signal
WR
××
: Write signal