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CHAPTER 5 PORT FUNCTIONS
User’s Manual U12697EJ3V0UM
Figure 5-5. Block Diagram of P21, P23 to P24, and P26
P-ch
WR
PM
WR
PORT
RD
WR
PU
V
DD
Selector
PU21, PU23, PU24,
PU26
Output Latch
(P21, P23, P24, P26)
PM21, PM23, PM24,
PM26
Internal bus
Alternate function
P21/SO1/T
X
D1,
P23/PCL,
P24/BUZ,
P26/SO0
PU: Pull-up resistor option register
PM: Port mode register
RD: Port 2 read signal
WR: Port 2 write signal