CHAPTER 4 PORT FUNCTIONS
User’s Manual U17446EJ3V1UD
59
Figure 4-10. Block Diagram of P42
P42/TOH1
WR
PU
RD
WR
PORT
WR
PM
PU42
Output latch
(P42)
PM42
Alternate
function
V
DD
P-ch
PM4
PU4
Internal bus
Selector
P4
PU4:
Pull-up resistor option register 4
P4:
Port register 4
PM4:
Port mode register 4
RD:
Read signal
WR
××
: Write signal