Bosch 6000 User's Guide download pdf (Page 78)

Chapter 2. Communication

PC-AT Interrupts

NOTE

This section uses a generic reference (“AT6nnn”) to represent all 6000 Series bus-based

products. When referring to the file names and programming examples, substitute the name

of your product where you read “AT6nnn”. (e.g., if you are using the AT6450, type “AT6450”)

Exceptions: For the OEM-AT6400, AT6200, & OEM-AT6200 products, type “AT6400”.

This section describes how to write PC-AT software that exploits the interrupt capability of

the bus-based 6000 Series controller (AT6nnn). To best understand the interrupt function, this

section is organized as follows:

• AT6nnn interrupt path

• How to use interrupts

• Practical Example: Using the interrupt-driven terminal emulator (MC6ØTRMI) provided

in the DOS Support Disk

AT6nnn Interrupt Path

The 6000 Series controller is capable of interrupting the PC-AT. When interrupted, the 80x86

processor executes an interrupt service routine (ISR). The path that the controller interrupt

takes to get to the 80x86 processor is shown below.

Interrupt

Service

Routine

(ISR)

80x86

Interrupt

Vector Table

80x86

Maskable

Interrupt Enable

8259

Interrupt

Enable

AT6nnn

Interrupt

Enable

AT6nnn

Interrupt

Notice that the AT6nnn interrupt must get by three different interrupt enables before the 80x86

processor can be interrupted:

1. Interrupts must be enabled within the AT6nnn.

2. Appropriate PC-AT hardware interrupt must be enabled within the 8259 interrupt

controller.

3. The interrupt flag must be set within the 80x86 processor.

When the AT6nnn interrupt arrives at the 80x86 processor, the address of the interrupt service

routine must be in the interrupt vector table so that the 80x86 processor knows where to

handle the interrupt.

AT6nnn

Interrupt Enable

Up to four different kinds of interrupts can be enabled within the AT6nnn:

• Interrupt PC-AT when AT6nnn output buffer has data

• Interrupt PC-AT when AT6nnn input buffer (256 bytes/characters) is empty

• Interrupt PC-AT when AT6nnn hardware interrupt condition occurs (see description of

INTHW command in 6000 Series Software Reference)

• Interrupt PC-AT when AT6nnn status has been updated

AT6nnn interrupts are enabled/disabled by writing to the AT6nnn interrupt enable register

(AT6nnn base port address + 4).

Also, DIP switch package S2 on the AT6nnn card must be set to the appropriate hardware

interrupt request line (IRQ0-IRQ15). Refer to the table below. IRQ0-IRQ15 are signals that

reside on the PC-AT bus. Setting a switch to the ON position connects the AT6nnn interrupt

line to a PC-AT interrupt request (IRQ) line. Make sure only one switch is ON at one time.

Interrupt Request Line AT6nnn Interrupt DIP Switch

IRQ3

IRQ4

IRQ5

IRQ7

IRQ10

IRQ11

IRQ12

IRQ15

S2.1

S2.2

S2.3

S2.4

S2.5

S2.6

S2.7

S2.8

Refer to your product's

Installation Guide

to locate the DIP switch.

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Bosch 6000 User's Guide Page 78

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