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© Sealevel Systems, Inc.
8006H Manual | SL9023H 9/2021
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.
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
Содержание ISO-16.PCI
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