Acces PAD128, User Manual

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Page 6-1
Manual MPAD128.D1g
Chapter 6: Programming
Port Addresses and Functions
All I/O accesses may be performed with byte- or word-sized reads and writes. The
registers related to the A/D functions are usually accessed with words, and the Digital
functions are accessed by either bytes or words, depending on the specific goal. The
following table describes the analog registers as words, and the digital registers as bytes.
Add ress Write Operation Read Operation
Base 0 A/D Po int Setup A/D Point Readback
Base 2 A/D Po int Setup A/D Point Readback
Base 4 A/D Po int Setup A/D Point Readback
Base 6 A/D Po int Setup A/D Point Readback
Base 8 A/D Po int Setup A/D Point Readback
Base A A/D Po int Setup A/D Point Readback
Base C A/D Po int Setup A/D Point Readback
Base E A/D Po int Setup A/D Point Readback
Base A 10 A/D Control A/D Control Readback
Base A 14 advanced features A/D Status
Base A 18 unused A/D Data FIFO
Base A 20 (byte) 825 5 P ort A W rite 8255 Port A Read
Base A 21 (byte) 825 5 P ort B W rite 8255 Port B Read
Base A 22 (byte) unuse d po rt C unuse d po rt C
Base A 23 8255 Control Register 8255 Control Readback
Table 6-1:
PAD128 Register Definition Map (HEX)
Note
The listed registers are a subset of the capabilities of the A/D Chip. The device is
capable of threshold monitoring, extended calibration modes, differential channel
selection on a pin-by-pin basis, configurable settle times per input for poor sensor types,
complex FIFO functions, and much more. Please refer to the National Semiconductor
LM12H458 chip specification for complete information on this incredibly flexible
device.