CHAPTER 4 PORT FUNCTIONS
User’s Manual U16898EJ3V0UD
55
Figure 4-7. Block Diagram of P41 and P44
P41/INTP3,
P44/RxD6
WR
PU
RD
WR
PORT
WR
PM
PU41, PU44
Alternate
function
Output latch
(P41, P44)
PM41, PM44
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