CHAPTER 4 PORT FUNCTIONS
Preliminary User’s Manual U16315EJ1V0UD
92
Figure 4-13. Block Diagram of P33
P33/INTP4/TI51/TO51
WR
PU
RD
WR
PORT
WR
PM
PU33
Alternate
function
Output latch
(P33)
PM33
Alternate
function
EV
DD
P-ch
Selector
Internal bus
PU0:
Pull-up resistor option register 3
PM:
Port mode register
RD:
Port 3 read signal
WR:
Port 3 write signal