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CHAPTER 4 PORT FUNCTIONS
Preliminary User’s Manual U13420EJ2V0UM00
4.2.5 Port 5
Port 5 is an 8-bit input/output port with output latch. Input mode/output mode can be specified for pins P50 to P57
in 1-bit units with port mode register 5 (PM5). For pins P50 to P57, an on-chip pull-up resistor can be specified in
1-bit units with pull-up resistor option register 5 (PU5).
This port can also be used as an address bus in external memory expansion mode.
RESET input sets port 5 to input mode.
Figure 4-6 shows a block diagram of port 5.
Figure 4-6. Block Diagram of P50 to P57
PU: Pull-up resistor option register
PM: Port mode register
RD: Port 5 read signal
WR: Port 5 write signal
RD
P50/A8 to
P57/A15
P-ch
WR
PU
WR
PORT
WR
PM
PU50 to PU57
Output latch
(P50 to P57)
PM50 to PM57
Selector
V
DD0
Internal bus
Содержание mPD780065 Series
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