Measurement-computing CIO-DAS08-AOH Manuel d'utilisateur télécharger pdf (Page 14)

Table 6-2. Register Functions

82C55 ControlNoneBASE + 15

PORT C 82C55PORT C 82C55BASE + 14

PORT B 82C55PORT B 82C55BASE + 13

PORT A 82C55PORT A 82C55BASE + 12

DAC 1 High Byte (& individual update) Simultaneous UpdateBASE + 11

DAC 1 Low ByteSimultaneous UpdateBASE + 10

DAC 0 High Byte (& individual update)Simultaneous UpdateBASE + 9

DAC 0 Low ByteSimultaneous UpdateBASE + 8

Counter ControlNot usedBASE + 7

Load Counter 2Read Counter 2BASE + 6

Load Counter 1Read Counter 1BASE + 5

Load Counter 0Read Counter 0BASE + 4

Programmable gain controlChannel MUX and Gain StatusBASE + 3

OP1 - OP4, INTE & MUX AddressEOC, IP1 - IP3, IRQ, MUX AddressBASE + 2

Start 12 bit A/D conversionA/D Bits 1 (MSB) - 8BASE + 1

Start 8 bit A/D conversionA/D Bits 9 - 12 (LSB)BASE

WRITE FUNCTIONREAD FUNCTIONADDRESS

6.2 A/D DATA REGISTER

BASE ADDRESS (Read / Write)

0000A/D12

LSB

A/D11A/D10A/D9

01234567

READ

On read, it contains the least significant four digits of the analog input data.

These four bits of analog input data must be combined with the eight bits of analog input data in BASE + 1, forming a

complete 12 bit number. The data is in the format 0 = minus full scale. 4095 = +FS.

WRITE

Writing any data to the register causes an immediate 8-bit A/D conversion.

BASE ADDRESS + 1 (Read / Write)

A/D8A/D7A/D6A/D5A/D4A/D3A/D2A/D1

MSB

01234567

READ

On read the most significant A/D byte is read.

The A/D Bits code corresponds to the voltage on the input according to the table below.

0 Volts- Full Scale00

½ Full Scale0 Volts8002048

+ Full Scale+ Full ScaleFFF4095

UNIPOLARBIPOLARHEXDECIMAL

WRITE

Writing to this register starts a 12-bit A/D conversion.

A note of caution: Place several NO-OP instructions between consecutive 12-bit A/D conversions to avoid overrunning the

A/D converter.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 31 32

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Measurement-computing CIO-DAS08-AOH Manuel d'utilisateur Page 14

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