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CHAPTER 5 PORT FUNCTIONS
5.2.7 Port 6
Port 6 is a 2-bit input/output port with output latch. P60 and P61 pins can specify the input mode/output mode
in 1-bit units with the port mode register 6 (PM6).
Alternate functions include clock output and sound generator output.
RESET input sets port 6 to input mode.
Figure 5-8 shows a block diagram of port 6.
Figure 5-8. P60 and P61 Block Diagram
PM : Port mode register
RD : Port 6 read signal
WR : Port 6 write signal
RD
P60/PCL/SGOA
P61/SGO/SGOF
WR
PORT
WR
PM
Output latch
(P60, P61)
PM60, PM61
Alternate
functions
Selector
Internal bus
Содержание mPD780973 Series
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