Measurement-computing CIO-DAS16 Instrukcja Użytkownika Pobierz pdf (Strona 29)

82C54 COUNTER 2 DATA

BASE ADDRESS +14

D0D1D2D3D4D5D6D7

01234567

The three 82C54 counter/timer data registers may be written to and read from. Because each counter can count to

65,535, loading or reading the counter data must be a multi-step process. The operation of the 82C54 is explained in the

Intel 82C54 data sheet.

82C54 COUNTER CONTROL

BASE ADDRESS +15

D0D1D2D3D4D5D6D7

01234567

This register controls the operation and loading/reading of the counters. The configuration of the 82C54 codes which

control the 82C54 chip is explained in the Intel 82C54 data sheet.

4.11 24-LINE DIGITAL I/O REGISTERS

PORT A DATA

BASE ADDRESS +16

A0A1A2A3A4A5A6A7

01234567

PORT B DATA

BASE ADDRESS +17

B0B1B2B3B4B5B6B7

01234567

Ports A and B may be programmed as input or output. Each is written to and read from in bytes, although for control and

monitoring purposes the individual bits are used.

Bit set/reset and bit read functions require that unwanted bits be masked out of reads and ORed into writes.

PORT C DATA

BASE ADDRESS +18

CL0CL1CL2CL3CH0CH1CH2CH3

C0C1C2C3C4C5C6C7

01234567

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 35 36

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