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I/O Ports
15-12
15.3.2 Register Descriptions
Port 1 is a general-purpose input/output port that is also used for data bus signals D[7:0], address strobe
signal AS, and read/write select RWSEL.
Each register for port 1 is described below.
Port 1 output register
Register symbol: P1OUT
Address: x'36008001
Purpose: This register sets the data to be output on port 1.
Bit No. 76543210
Bit name P17O P16O P15O P14O P13O P12O P11O P10O
Reset 00000000
Access R/W R/W R/W R/W R/W R/W R/W R/W
Port 1 pin register
Register symbol: P1IN
Address: x'36008081
Purpose: This register reads the values of the port 1 pins.
Bit No. 76543210
Bit name P17I P16I P15I P14I P13I P12I P11I P10I
Reset XXXXXXXX
Access RRRRRRRR