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Chapter 4 Register Map and Descriptions
©
National Instruments Corporation 4-65 AT-MIO-16X User Manual
Am9513A Data Register
With the Am9513A Data Register, any of the 18 internal registers of the
Am9513A can be written to or read from. The Am9513A Command
Register must be written to in order to select the register to be accessed
by the Am9513A Data Register. The internal registers accessed by the
Am9513A Data Register are as follows:
• Counter Mode Registers for Counters 1, 2, 3, 4, and 5
• Counter Load Registers for Counters 1, 2, 3, 4, and 5
• Counter Hold Registers for Counters 1, 2, 3, 4, and 5
• The Master Mode Register
• The Compare Registers for Counters 1 and 2
All these registers are 16-bit registers. Bit descriptions for each of these
registers are included in Appendix C, AMD Am9513A Data Sheet.
Address: Base address + 14 (hex)
Type: Read-and-write
Word Size: 16-bit
Bit Map:
Bit Name Description
15-0 D<15..0> These 16 bits are loaded into the
Am9513A Internal Register currently
selected. See Appendix C, AMD
Am9513A Data Sheet, for the detailed bit
descriptions of the 18 registers accessed
through the Am9513A Data Register.
15
D15
14
D14
13
D13
12
D12
11
D11
10
D10
9
D9
8
D8
7
D7
6
D6
5
D5
4
D4
3
D3
2
D2
1
D1
0
D0
LSBMSB