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CHAPTER 5 PORT FUNCTIONS
5.2.6 Port 5
Port 5 is a 5-bit input/output port with output latch. P50 to P54 pins can specify the input mode/output mode in
1-bit units with the port mode register 5 (PM5).
Alternate functions include serial interface data input/output and clock input/output.
RESET input sets port 5 to input mode.
Figure 5-7 shows a block diagram of port 5.
Figure 5-7. P50 to P54 Block Diagram
PM : Port mode register
RD : Port 5 read signal
WR : Port 5 write signal
RD
P50/SCK
P51/SO
P52/SI
P53/RxD
P54/TxD
WR
PORT
WR
PM
Output latch
(P50 to P54)
PM50 to PM54
Alternate
functions
Selector
Internal bus
Содержание mPD780973 Series
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