SeaLevel ISO-16.PCI User Manual page 12

PROGRAMMING THE ISO-16.PCI, CONTINUED
Direct Hardware Control
In systems where the user's program has direct access to the hardware (DOS) the table below gives the
mapping and functions that the ISO-16.PCI provide. The address of each eight-bit port is calculated as
shown in the table on the following page, the cards base address plus an offset.
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.
Register Description
Address Mode
Base+0 R/W
Base+1 R/W
Base+2
Base+3
Base+4
Base+5 R/W
Base+6
Base+7
Interrupt Control
When enabled, interrupts are generated on Port A bit D0.
IRQEN
IRC0
IRC1
© Sealevel Systems, Inc.
Function Available
R
R
R = Read
D7 D6
PAD7 PAD6
PBD7 PBD6
R {0} {0}
R {0} {0}
R {0} {0}
IRQEN IRQST
R {0} {0}
R {0} {0}
Interrupt enable
Interrupt mode select, see table below
Interrupt mode select, see table below
8006H Manual | SL9023H 9/2021
Port Address Hex
A Base + 0
B Base + 1
D5 D4 D3
PAD5 PAD4 PAD3
PBD5 PBD4 PBD3
{0} {0} {0}
{0} {0} {0}
{0} {0} {0}
{0} {0} {0}
{0} {0} {0}
{0} {0} {0}
1 = enabled 0 = disabled (0 on power up)
D2 D1 D0
PAD2 PAD1 PAD0
PBD2 PBD1 PBD0
{0} {0} {0}
{0} {0} {0}
{0} {0} {0}
{0} IRC1 IRC0
{0} {0} {0}
{0} {0} {0}
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