Adlink ACL-8112 Series Manual do Utilizador descarregar pdf (Página 49)

Registers • 41

4.10 Internal Timer/Counter Register

Two 8254 counters are used for periodical triggering of the A/D converter,

with one left for user applications. The 8254 occupies 4 I/O address

locations in the ACL-8112 as listed blow. Users may refer to NEC's or Intel's

data sheet for full detail of the 8254. Summarized information is specified in

Appendix B.

Address : BASE + 0 ~ BASE + 3

Attribute: read / write

Data Format:

Base + 0 Counter 0 Register ( R/W)

Base + 1 Counter 1 Register ( R/W)

Base + 2 Counter 2 Register ( R/W)

Base + 3 8254 CONTROL BYTE

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 91 92

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Adlink ACL-8112 Series Manual do Utilizador Página 49