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I/O Ports
15-42
15.9.2 Register Descriptions
Port 7 is a general-purpose output port that is also used for address bus signal A23, DRAM RAS signals RAS2
and RAS1, chip select signals CS3 to CS0.
Each register for port 7 is described below.
Port 7 output register
Register symbol: P7OUT
Address: x'3600800D
Purpose: This register sets the data to be output on port 7.
Bit No. 76543210
Bit name ----P73O P72O P71O P70O
Reset 00000000
Access RRRRR/WR/WR/WR/W
Port 7 output mode register
Register symbol: P7MD
Address: x'3600802D
Purpose: This register selects the content output on the port 7 pins.
Bit No. 76543210
Bit name ----P73M P72M P71M P70M
Reset 00000000
Access RRRRR/WR/WR/WR/W