Measurement-computing PPIO-DIO24H Manual de usuario descargar pdf (Pagina 11)

Table 4-1. Bit Weights

801287

40646

20325

10164

883

442

221

110

HEX VALUEDECIMAL VALUEBIT POSITION

To write a control word or data to a register, the individual bits must be set to 0 or 1

then combined to form a byte.

The method of programming required to set/read bits from bytes is beyond the scope

of this manual. It is covered in most Introduction To Programming books.

In summary form, the registers and their function are listed on the following table.

Each register has eight bits which can constitute a byte of data or can be eight

individual bit set/read functions.

Table 4-2. Register Functions

ConfigureNone. No read back.3

Port C OutputsPort C Inputs2

Port B OutputsPort B Inputs1

Port A OutputsPort A Inputs 0

WRITE FUNCTIONREAD FUNCTIONADDRESS

4.4 DIGITAL I/O REGISTERS

PORT A DATA

A0A1A2A3A4A5A6A7

01234567

PORT B DATA

B0B2B2B3B4B5B6B7

01234567

Ports A & B can be programmed as input or output. Each is written to and read from

in bytes. For control and monitoring purposes, individual bits are usually used. Mask

unwanted bits out of reads and writes.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16

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Measurement-computing PPIO-DIO24H Manual de usuario Pagina 11