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I/O Ports
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.
7
6
Bit name P17O P16O P15O P14O P13O P12O P11O P10O
Reset
0
0
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.
7
6
Bit name
P17I P16I P15I P14I P13I P12I P11I P10I
Reset
X
X
Access
R
R
15-12
5
4
3
2
0
0
0
0
5
4
3
2
X
X
X
X
R
R
R
R
1
0
0
0
1
0
X
X
R
R
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