Impulse 8006 Instrukcja Użytkownika Pobierz pdf (Strona 11)

© Sealevel Systems, Inc.

- 9 -

ISO-16.PCI User Manual

Reading the Inputs

The inputs are active Low. If no voltage is applied across one of the differential

inputs it returns a one on that bit. If an AC or DC voltage (of sufficient magnitude,

covered above) is applied it returns a zero on that bit.

Function Available Port Address Hex

R A Base + 0

R B Base + 1

R = Read

Register Description

Address Mode D7 D6 D5 D4 D3 D2 D1 D0

Base+0

R/W PAD7 PAD6 PAD5 PAD4 PAD3 PAD2 PAD1 PAD0

Base+1

R/W PBD7 PBD6 PBD5 PBD4 PBD3 PBD2 PBD1 PBD0

Base+2

R {0} {0} {0} {0} {0} {0} {0} {0}

Base+3

R {0} {0} {0} {0} {0} {0} {0} {0}

Base+4

R {0} {0} {0} {0} {0} {0} {0} {0}

Base+5

R/W IRQEN IRQST {0} {0} {0} {0} IRC1 IRC0

Base+6

R {0} {0} {0} {0} {0} {0} {0} {0}

Base+7

R {0} {0} {0} {0} {0} {0} {0} {0}

Interrupt Control

When enabled, interrupts are generated on Port A bit D0.

IRQEN

Interrupt enable 1 = enabled 0 = disabled ( 0 on power up )

IRC0

IRC1

Interrupt mode select, see table below

Interrupt mode select, see table below

Interrupt Mode Select Table

Interrupt source is Base+0 bit D0. When selecting the Interrupt Type, always disable

interrupts prior to changing or setting states. This will help prevent inadvertent or

unexpected interrupts from occurring.

IRC1 IRC0 Interrupt Type

0 0 Low Level

0 1 High Level

1 0 Falling Edge

1 1 Rising Edge

Warning: When using the High and Low Level interrupts, an interrupt occurs when

input D0 changes to either a High or Low state. This will cause the computer to

remain in an interrupt state until the input state changes.

Interrupt Read

Reading the Interrupt Status port (Base+5) clears any interrupt pending.

IRQST (D0) Interrupt Status 1 = interrupt pending, 0 = none

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 17 18

Komentarze do niniejszej Instrukcji

Brak uwag