PIC16F871 Datasheet

IC型号：
PIC16F871
PDF描述：
28/40-Pin, 8-Bit CMOS FLASH Microcontrollers
文件大小：
1755.40KB
PDF页数：
172页
芯片厂家：
Microchip

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PIC16F870/871

11.10.1 INT INTERRUPT

External interrupt on the RB0/INT pin is edge triggered,

either rising, if bit INTEDG (OPTION_REG<6>) is set,

or falling, if the INTEDG bit is clear. When a valid edge

appears on the RB0/INT pin, flag bit INTF

(INTCON<1>) is set. This interrupt can be disabled by

clearing enable bit INTE (INTCON<4>). Flag bit INTF

must be cleared in software in the interrupt service rou-

tine before re-enabling this interrupt. The INT interrupt

can wake-up the processor from SLEEP, if bit INTE was

set prior to going into SLEEP. The status of global inter-

rupt enable bit GIE decides whether or not the proces-

sor branches to the interrupt vector following wake-up.

See Section 11.13 for details on SLEEP mode.

11.10.2 TMR0 INTERRUPT

An overflow (FFh

鈫?/div>

00h) in the TMR0 register will set

flag bit T0IF (INTCON<2>). The interrupt can be

enabled/disabled by setting/clearing enable bit T0IE

(INTCON<5>). (Section 5.0)

11.10.3 PORTB INTCON CHANGE

An input change on PORTB<7:4> sets flag bit RBIF

(INTCON<0>). The interrupt can be enabled/disabled

by setting/clearing enable bit RBIE (INTCON<4>).

(Section 3.2)

11.11

Context Saving During Interrupts

During an interrupt, only the return PC value is saved

on the stack. Typically, users may wish to save key reg-

isters during an interrupt, (i.e., W register and STATUS

Since the upper 16 bytes of each bank are common in

the PIC16F870/871 devices, temporary holding regis-

ters W_TEMP, STATUS_TEMP and PCLATH_TEMP

should be placed in here. These 16 locations don鈥檛

require banking and therefore, make it easier for con-

text save and restore. Example 11-1 can be used to

save and restore context for interrupts.

EXAMPLE 11-1: SAVING STATUS, W, AND PCLATH REGISTERS IN RAM

MOVWF

SWAPF

CLRF

MOVWF

MOVF

MOVWF

CLRF

:(ISR)

MOVF

MOVWF

SWAPF

MOVWF

SWAPF

W_TEMP

STATUS,W

STATUS

STATUS_TEMP

PCLATH, W

PCLATH_TEMP

PCLATH

;Copy

;Swap

;bank

;Save

;Only

;Save

;Page

W to TEMP register

status to be saved into W

0, regardless of current bank, Clears IRP,RP1,RP0

status to bank zero STATUS_TEMP register

required if using pages 1, 2 and/or 3

PCLATH into W

zero, regardless of current page

PCLATH_TEMP, W

PCLATH

STATUS_TEMP,W

STATUS

W_TEMP,F

W_TEMP,W

;Restore PCLATH

;Move W into PCLATH

;Swap STATUS_TEMP register into W

;(sets bank to original state)

;Move W into STATUS register

;Swap W_TEMP

;Swap W_TEMP into W

DS30569A-page 100

Preliminary

漏

1999 Microchip Technology Inc.

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