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Chapter 4 Register-Level Programming
© National Instruments Corporation 4-19 Lab-NB User Manual
Counter A2 Data Register
The Counter A2 Data Register is used for loading and reading back contents of 8253(A)
counter A2.
Address: Base address + 4 0020 (hex)
Type: Read-and-write
Word Size: 8-bit
Bit Map:
76543210
D7 D6 D5 D4 D3 D2 D1 D0
Bit Name Description
7–0 D<7..0> Data Bit—8-bit counter A2 contents.