Interrupt; Serial Port 1 And 2; Parallel Port; Single Interrupt - Common Interrupt - Addi-Data ADDICOM PA 7400 Series Technical Description

Technical description
8.5

Interrupt

Serial port 1 and 2

•
Select for serial port 1 the wished interrupt line through J8 and
jumper field J31.

Parallel port

•
Select for the parallel port the wished interrupt line through jumper J29.

Single interrupt - Common interrupt

You can operate the board PA 7400 either with
•
single interrupt
•
or common interrupt.

Analysing the common interrupt

You can analyse the common interrupt as follows:
- with the INTERRUPT IDENTIFICATION REGISTER of the DUART
component.
- or with bits INT1 and INT2
Bits D7 and D6 of address Base-S1 +7.
Base-S1(2) +1
INTERRUPT IDENTIFICATION
Base-S1(2) +2
Base-S1 +7 INT2 INT1
D7
•
Establish with the status bits INT1 and INT2 which serial port has triggered
the interrupt request.
INT1 = 0
INT1 = 1
INT2 = 0
INT2 = 1
Chapter 8

Table 8-4: I/O map

I/O Read
INTERRUPT ENABLE REGISTER A(B)
REGISTER A(B)
DATA-
DIR-2
D6 D1
No interrupt request has been triggered
(serial port 1)
An interrupt request has been triggered
(serial port 1)
No interrupt request has been triggered
(serial port 2)
An interrupt request has been triggered
(serial port 2)
DATA- RD-
DIR-1 EN-2
D0 D3
PA 7400
I/O Write
DATA- RD- DATA-
DIR-2 EN-1 DIR-1
D2 D1 D0
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