Measurement-computing PCM-D24/CTR3 rev.3 Uživatelský manuál stáhnout pdf (Strana 16)

7 I/O ADDRESS MAP & REGISTER FUNCTIONS

A base address register controls the beginning, or 'Base Address' of the I/O addresses

occupied by the control registers of the PCM-D24/CTR3. In all, 9 addresses are occu-

pied. The base address assigned by CSS is stored in the CB.CBG file by InstaCAL

and read by Universal Library. Please read about installing and using InstaCal.

7.1 CONTROL REGISTERS

Once CSS is installed and a base address has been established, the PCM-D24/CTR3

may be controlled by writing to and reading from the control registers. While it is

possible to write your own control routines for the PCM-D24/CTR3, routines have

been written and are available in Universal Library for DOS and Windows program-

ming languages.

NOTE ON REGISTER PROGRAMMING SUPPORT

While the complete register map is explained here, only very limited support for

assembly language or direct register programming is available. Register level pro-

gramming should only be attempted by experienced programmers. We support the

use of the PCM-D24/CTR3 through high level languages using UniversalLibrary and

the example programs provided.

7.2 PORT ADDRESSES & FUNCTIONS

Read back of controlInterrupt & Clock Source ControlBase + 8

None82C54 ControlBase + 7

Counter 2 read count data82C54 Counter 2 LoadBase + 6

Counter 1 read count data82C54 Counter 1 LoadBase + 5

Counter 0 read count data82C54 Counter 0 LoadBase + 4

None82C55 ControlBase + 3

Port C Input, Read back output82C55 Port C SetBase + 2

Port B Input, Read back output82C55 Port B SetBase + 1

Port A Input, Read back output82C55 Port A SetBase + 0

READWRITEADDRESS

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 25 26

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Measurement-computing PCM-D24/CTR3 rev.3 Uživatelský manuál Strana 16