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CHAPTER 5 PORT FUNCTIONS
User’s Manual U12697EJ3V0UM
Figure 5-11. Block Diagram of P50 to P57
WR
PU0
PUO5
MM0 to MM3
WR
PM5
PM50 to PM75
RD
PU0
WR
P5
RD
P5
Output latch
(P50 to P57)
RD
PM5
V
DD0
P50/A8 to
P57/A15
Internal data bus
Internal address bus
I/O controller
PUO: Pull-up resistor option register
PM:
Port mode register
RD:
Port 5 read signal
WR:
Port 5 write signal
MM0 to MM3: Bits 0 to 3 of the memory expansion mode register (MM)