Measurement-computing PCI-COM232 Bedienungsanleitung PDF herunterladen (Seite 16)

4.2 Register Descriptions

4.2.1

INTERRUPT STATUS/CONTROL

BADR1 + 4C hex

This register, and all 9052 registers, is 32 bits long. Since the rest of the register has specific control

functions, mask them off to access the interrupt control functions. INTE is the Interrupt Enable: 0 =

disabled, 1 = enabled (default). INTPOL is the Interrupt Polarity: 0 = active low (default), 1 = active high.

INT is the Interrupt Status: 0 = interrupt is not active, 1 = interrupt is active.

READ/WRITE

31:876543210

xxxxxxINTINTPOLINTE

The UART ports are 16C550 compatible. See any 16C550 data sheet for register functions.

AVAILABLE PORTS:

PCI-COM232: PORT 1

PCI-COM232/2: PORTS 1-2

PCI-COM232/4: PORTS 1-4

4.2.2

PORT 1 CLOCK SELECT / INTERRUPT STATUS

BADR2 + 07 hex

READ

76543210

--PORT1

CKSEL1

PORT1

CKSEL0

INT4 INT3 INT2 INT1

WRITE

76543210

--PORT1

CKSEL1

PORT1

CKSEL0

----

INTx: Interrupt status for each port: the same signals are connected to this read register for all four ports.

CKSEL1:0 UART clock select. This allows transmission rates to 460.8 Kbaud and different rates on each

port. These settings are per port:

CKSEL1 CKSEL0

UART CLOCK Max Data Rate

0 0 1.8432 MHz 115.2 kbaud

0 1 3.6864 MHz 230.4 kbaud

1 0 7.3728 MHz 460.8 kbaud

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 22 23 24

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Measurement-computing PCI-COM232 Bedienungsanleitung Seite 16