Measurement-computing PC104-DAS08 Manual de usuario descargar pdf (Pagina 13)

Table 3-2. Board Registers

Counter ControlNot usedBASE + 7

Load Counter 2Read Counter 2BASE + 6

Load Counter 1Read Counter 1BASE + 5

Load Counter 0Read Counter 0BASE + 4

Not usedNot usedBASE + 3

OP1-OP4, INTE & MUX

Address

EOC, IP1-IP3, IRQ, MUX

Address

BASE + 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

3.2 A/D DATA REGISTER

BASE ADDRESS

0000A/D12

LSB

A/D11A/D10A/D9

01234567

A read/write register.

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

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

MSB

01234567

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 23 24

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Measurement-computing PC104-DAS08 Manual de usuario Pagina 13