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Appendix D
Register-Level Programming
Counter 1 Data Register
Use the Counter 1 Data Register to load and read back contents of MSM82C53 counter 1.
Address:
Type:
Word Size: 8-bit
Bit Map:
7
6
D7
D6
Bit
7–0
Counter 2 Data Register
Use the Counter 2 Data Register to load and read back contents of MSM82C53 counter 2.
Address:
Type:
Word Size: 8-bit
Bit Map:
7
6
D7
D6
Bit
7–0
PC-LPM-16/PnP User Manual
Base address + 09 (hex)
Read-and-write
5
4
D5
D4
Name
Description
D<7..0>
A/D Conversion Data Bits 7 through 0—8-bit
counter 1 contents.
Base address + 0A (hex)
Read-and-write
5
4
D5
D4
Name
Description
D<7..0>
A/D Conversion Data Bits 7 through 0—8-bit
counter 2 contents.
3
2
D3
D2
3
2
D3
D2
D-20
1
0
D1
D0
1
0
D1
D0
National Instruments Corporation
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