參數(shù)資料
型號： PIC16CR74-I/L
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 5/172頁
文件大?。?/td> 2964K
代理商： PIC16CR74-I/L
PIC16CR7X
DS21993C-page 100
2007 Microchip Technology Inc.
12.11.1
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
Routine before re-enabling this interrupt. The INT inter-
rupt can wake-up the processor from Sleep, if bit INTE
was set prior to going into Sleep. The status of global
interrupt enable bit GIE decides whether or not the
processor branches to the interrupt vector following
(Sleep)” for details on Sleep mode.
12.11.2
TMR0 INTERRUPT
An overflow (FFh
→ 00h) in the TMR0 register will set
flag bit TMR0IF (INTCON<2>). The interrupt can be
enabled/disabled by setting/clearing enable bit TMR0IE
12.11.3
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<3>), see
12.12 Context Saving During Interrupts
During an interrupt, only the return PC value is saved
on the stack. Typically, users may wish to save key
registers during an interrupt (i.e., W, PCLATH and
STATUS registers). This will have to be implemented in
software, as shown in Example 12-1.
For the PIC16CR73/74 devices, the register W_TEMP
must be defined in both banks 0 and 1 and must be
defined at the same offset from the bank base address
(i.e., If W_TEMP is defined at 20h in bank 0, it must
also be defined at A0h in bank 1.). The registers,
PCLATH_TEMP and STATUS_TEMP, are only defined
in bank 0.
Since the upper 16 bytes of each bank are common in
the PIC16CR76/77 devices, temporary holding regis-
ters W_TEMP, STATUS_TEMP and PCLATH_TEMP
should be placed in here. These 16 locations don’t
require banking and, therefore, make it easier for
context save and restore. The same code shown in
Example 12-1 can be used.
EXAMPLE 12-1:
SAVING STATUS, W AND PCLATH REGISTERS IN RAM
MOVWF
W_TEMP
;Copy W to TEMP register
SWAPF
STATUS,W
;Swap status to be saved into W
CLRF
STATUS
;bank 0, regardless of current bank, Clears IRP,RP1,RP0
MOVWF
STATUS_TEMP
;Save status to bank zero STATUS_TEMP register
MOVF
PCLATH, W
;Only required if using pages 1, 2 and/or 3
MOVWF
PCLATH_TEMP
;Save PCLATH into W
CLRF
PCLATH
;Page zero, regardless of current page
:
:(ISR)
;Insert user code here
:
MOVF
PCLATH_TEMP, W
;Restore PCLATH
MOVWF
PCLATH
;Move W into PCLATH
SWAPF
STATUS_TEMP,W
;Swap STATUS_TEMP register into W
;(sets bank to original state)
MOVWF
STATUS
;Move W into STATUS register
SWAPF
W_TEMP,F
;Swap W_TEMP
SWAPF
W_TEMP,W
;Swap W_TEMP into W
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