CHAPTER 4 PORT FUNCTIONS
Preliminary User’s Manual U19014EJ1V0UD
71
Figure 4-11. Block Diagram of P33
P33/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
PU3
PM3
P3
P3:
Port register 3
PU3:
Pull-up resistor option register 3
PM3:
Port mode register 3
RD: Read
signal
WR
××
: Write
signal
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