PIC18F14K50-I/SO【PDF 96/285 页】IC PIC MCU FLASH 8KX16 20-SOIC

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dsPIC30F1010/202X

DS70178C-page 184

Preliminary

2006 Microchip Technology Inc.

Example 16-1 shows a code sequence for using the

ADBASE register to implement ADC Input Pair Inter-

rupt Handling. When the ADBASE register is read, it

contains the sum of the base address of the jump table

and the encoded ADC channel pair number left shifted

by 2 bits.

For example, if ADBASE is initialized with a value of

0x0360, a channel pair 1 interrupt would cause an

ADBASE

read

value

0x0364

(0x360

0b00000100). A channel pair 3 interrupt would cause

an ADBASE

read

value of

0x036C

(0x360

0b00001100).

EXAMPLE 16-1:

ADC BASE REGISTER CODE

; Initialize and enable the ADC interrupt

MOV

#handle(JMP_TBL),W0

; Load the base address of the ISR Jump

MOV WO, ADBASE

; table in ADBASE.

BSET

IPC2,#12

; Set up the interrupt priority

BSET

IPC2,#13

BSET

IPC2,#14

BCLR

IFS0,#11

; Clear any pending interrupts

BCLR

ADSTAT

; Clear the ADC pair interrupts as well

BSET

IEC0,#11

; Enable the interrupt

; Code to Initialize the rest of the ADC registers

...

; ADC Interrupt Handler

__ADCInterrupt:

PUSH.S

; Save WO-W3 and SR registers

BCLR

IFSO,#11

; Clear the interrupt

MOV

ADBASE, W0

; ADBASE contains the encoded jump address

GOTO

; within JMP_TBL

; Here's the Jump Table

; Note: It is important to clear the individual IRQ flags in the ADC AFTER the IRQ flags

in the interrupt controller. Failure to do so may cause interrupt requests to be lost

JMP_TBL:

BCLR

ADSTAT,#0