C51 interrupt function format-EEWORLD

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C51 Keil compiler interrupt function syntax definition:

void function name() interrupt n using m

The C51 compiler allows 0 to 31 interrupts. The interrupts and interrupt addresses provided by the C51 controller are as follows:

Interrupt number Interrupt source Interrupt address

0 EXTERNAL 0 0003H

1 TIMER/COUNTER 0 000BH

2 EXTERNAL 1 0013H

3 TIMER/COUNTER 1 001BH

4 SERIAL PORT 0023H

Interrupt function writing rules:

Parameter passing is not possible

No return value

In any case, the interrupt function cannot be called directly

You can use using to specify the register group currently used in the interrupt function definition.

void function name() intrrupt n using m

R0~R7 are divided into 4 groups m: 0, 1, 2, 3

Keywords：C51 Reference address：C51 interrupt function format

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