Measurement-computing PC104-CTR10HD Manual de usuario descargar pdf (Pagina 11)

To write to or read from a register in decimal or HEX, the weights in Table 3-1 apply:

Table 3-1. Bit Weights

801287

40646

20325

10164

883

442

221

110

HEX VALUEDECIMAL VALUEBIT POSITION

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

combined to form a byte. Data read from registers must be analyzed to determine

which bits are on or off.

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

of this manual. It will be covered in most Introduction To Programming books,

available from a bookstore.

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

Each register has eight bits which may constitute a byte of data or eight individual bit

functions.

Table 2-2. Register Functions

Interrupt & CTR sourceNoneBASE + 400h

Commands to 9513 #2Status of 9513 #2BASE + 3h

Data for 9513 #2Data from 9513 #2BASE + 2h

Commands to 9513 #1Status of 9513 #1BASE + 1h

Data for 9513 #1Data from 9513 #1BASE + 0h

WRITE FUNCTIONREAD FUNCTIONADDRESS

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 19 20

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Measurement-computing PC104-CTR10HD Manual de usuario Pagina 11