Measurement-computing CIO-INT-32 Instrukcja Użytkownika Pobierz pdf (Strona 12)

The first I/O address, or BASE ADDRESS, is determined by setting a bank of

switches on the board.

To write to or read from a register in decimal or HEX, the following weights apply:

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 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

set/read functions.

ControlStatusBASE + 7

Port APort ABASE + 6

Port BPort BBASE + 5

Port CPort CBASE + 4

Second Z8536 Processor

ControlStatusBASE + 3

Port A OutputPort A InputBASE + 2

Port B OutputPort B InputBASE + 1

Port C OutputPort C InputBASE + 0

First Z8536 Processor

WRITE FUNCTIONREAD FUNCTIONADDRESS

Refer to the Zilog Z8536 manual for programming instructions.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 23 24

Brak uwag

Measurement-computing CIO-INT-32 Instrukcja Użytkownika Strona 12