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Registers

3.2 I/O Address Map

All cPCI/PCI-8554/R registers are 8 bits long. Users can access these

registers using 8-bit I/O instructions. The following table shows the

registers address map, including descriptions and their offset addresses

relative to the base address.

I/O Address Write Read

Base + 0x00 ~ 0x03

Counter 1~3 & Mode

Control

Counter 1 ~ 3

Base + 0x04 ~ 0x07

Counter 4~6 & Mode

Control

Counter 4 ~ 6

Base + 0x08 ~ 0x0B

Counter 7~9 & Mode

Control

Counter 7 ~ 9

Base + 0x0C ~0x0F

Counter 10~12 & Mode

Control

Counter 10 ~ 12

Base + 0x10 ~ 0x12 Clock Mode Control - -

Base + 0x18 Digital Output Digital Input

Table 4. I/O Address Map of cPCI/PCI-8554/R

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 66 67

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