Measurement-computing PCM-D24/CTR3 rev.3 Manuel d'utilisateur télécharger pdf (Page 20)

information, all of which is contained in the chip manufacturers data sheet. If you

would like more information, please visit Intel's web site at www.intel.com.

BASE + 8 Interrupt and Clock Source Control

Write control - Read back status

CLK0CLK1CKSEL0CKSEL1CKSEL2INT0INT1INT2

01234567

Interrupt Source Control

INT2 INT1 INT0 Interrupt source

0 0 0 No Interrupts

0 0 1 External Interrupt

0 1 0 Digital I/O Interrupt from 82C55. PC0 or PC3. See below.

0 1 1 Counter 0

1 0 0 Counter 1

1 0 1 Counter 2

PC0 and PC3 are the outputs of an 82C55 programmed in Mode 1 or Mode 2. These

two modes provide an interrupt output for use in closely coupled parallel interfaces.

To program an 82C55 for Mode 1 or 2 you will need an 82C55 data book. The Com-

puterBoards Universal Library supports Mode 0 only.

The counters on the PCM-D24/CTR3 have quite a bit of programmability. Due to the

architecture of the board, there is additional counter source and chaining flexibility

beyond the standard functions of an 82C54 .

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Measurement-computing PCM-D24/CTR3 rev.3 Manuel d'utilisateur Page 20