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Figure 6-3. P01 to P03 Block Diagrams
WR
PUO
PUO0
RD
WR
PORT
Output Latch
(P01 to P03)
WR
PM
PM01 to PM03
PUO : Pull-up resistor option register
PM
: Port mode register
RD
: Port 0 read signal
WR : Port 0 write signal
Figure 6-4. P04 Block Diagram
RD
RD
: Port 0 read signal
CHAPTER 6 PORT FUNCTIONS
Selector
V
DD
P-ch
P01/INTP1 to
P03/INTP3
P04/XT1
135
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