W78L812A24PL(2006) Просмотр технического описания (PDF) - Winbond

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W78L812A24PL
(Rev.:2006)

8-BIT MICROCONTROLLER

Winbond 

W78LE812/W78L812A

5.5 Interrupt System

The W78L812 has fourteen interrupt sources: INT0 and INT1; Timer 0,1 and 2; Serial Port; INT2 to

INT9. Each interrupt vectors to a specific location in program memory for its interrupt service routine.

Each of these sources can be individually enabled or disabled by setting or clearing the corresponding

bit in Special Function Register IE0 and IE1. The individual interrupt priority level depends on the

Interrupt Priority Register IP0 and IP1. Additional external interrupts INT2 to INT9 are level sensitive

and may be used to awake the device from power down mode. The Port 1 interrupts can be initialized

to either active HIGH or LOW via setting the Interrupt Polarity Register IX. The IRQ register contains

the flags of Port 1 interrupts. Each flag in IRQ register will be set when a interrupt request is

recognized but must be cleared by software. Note that the interrupt flags have to be cleared before the

interrupt service routine is completed, or else another interrupt will be generated.

5.5.1 Interrupt Enable Register 0

Bit:

7

6

5

4

3

2

1

0

EA

-

ET2

ES

ET1 EX1 ET0 EX0

Mnemonic: IE

Address: A8H

EA : Global enable. Enable/disable all interrupts.

ET2: Enable Timer 2 interrupt.

ES : Enable Serial Port interrupt.

ET1: Enable Timer 1 interrupt

EX1: Enable external interrupt 1

ET0: Enable Timer 0 interrupt

EX0: Enable external interrupt 0

5.5.2 Interrupt Enable Register 1

Bit:

7

6

5

4

3

2

1

0

EX9 EX8 EX7 EX6 EX5 EX4 EX3 EX2

Mnemonic: IE1

Address: E8H

EX9: Enable external interrupt 9

Note: 0 = interrupt disabled, 1 = interrupt enabled.

EX8: Enable external interrupt 8

EX7: Enable external interrupt 7

EX6: Enable external interrupt 6

EX5: Enable external interrupt 5

EX4: Enable external interrupt 4

EX3: Enable external interrupt 3

EX2: Enable external interrupt 2

Publication Release Date: November 6, 2006

-9-

Revision A9

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