參數(shù)資料
型號(hào)： PIC16CR7X
廠商： Microchip Technology Inc.
英文描述： 28/40-Pin, 8-Bit CMOS ROM Microcontrollers
中文描述： 28/40-Pin，8位微控制器的CMOS光盤
文件頁數(shù)： 101/172頁
文件大?。?/td> 1506K
代理商： PIC16CR7X
2007 Microchip Technology Inc.
DS21993C-page 99
PIC16CR7X
12.11 Interrupts
The PIC16CR7X family has up to 12 sources of
interrupt. The Interrupt Control register (INTCON)
records individual interrupt requests in flag bits. It also
has individual and global interrupt enable bits.
A Global Interrupt Enable bit, GIE (INTCON<7>)
enables (if set) all unmasked interrupts, or disables (if
cleared) all interrupts. When bit GIE is enabled and an
interrupt’s flag bit and mask bit are set, the interrupt will
vector immediately. Individual interrupts can be dis-
abled through their corresponding enable bits in
various registers. Individual interrupt bits are set,
regardless of the status of the GIE bit. The GIE bit is
cleared on Reset.
The “return from interrupt” instruction,
RETFIE
, exits
the interrupt routine, as well as sets the GIE bit, which
re-enables interrupts.
The RB0/INT pin interrupt, the RB port change interrupt
and the TMR0 overflow interrupt flags are contained in
the INTCON register.
The peripheral interrupt flags are contained in the
Special Function Registers, PIR1 and PIR2. The corre-
sponding interrupt enable bits are contained in Special
Function Registers, PIE1 and PIE2, and the peripheral
interrupt enable bit is contained in Special Function
Register, INTCON.
When an interrupt is responded to, the GIE bit is
cleared to disable any further interrupt, the return
address is pushed onto the stack and the PC is loaded
with 0004h. Once in the Interrupt Service Routine, the
source(s) of the interrupt can be determined by polling
the interrupt flag bits. The interrupt flag bit(s) must be
cleared in software before re-enabling interrupts to
avoid recursive interrupts.
For external interrupt events, such as the INT pin or
PORTB change interrupt, the interrupt latency will be
three or four instruction cycles. The exact latency
depends when the interrupt event occurs, relative to
the current Q cycle. The latency is the same for one or
two-cycle instructions. Individual interrupt flag bits are
set, regardless of the status of their corresponding
mask bit, PEIE bit or the GIE bit.
FIGURE 12-10:
INTERRUPT LOGIC
Note:
Individual interrupt flag bits are set,
regardless of the status of their corre-
sponding mask bit or the GIE bit.
PSPIF
(1)
PSPIE
(1)
ADIF
ADIE
RCIF
RCIE
TXIF
TXIE
SSPIF
SSPIE
CCP1IF
CCP1IE
TMR2IF
TMR2IE
TMR1IF
TMR1IE
TMR0IF
TMR0IE
INTF
INTE
RBIF
RBIE
GIE
PEIE
Wake-up (If in Sleep mode)
Interrupt to CPU
CCP2IE
CCP2IF
Note 1:
PSP interrupt is implemented only on
PIC16CR74/77
devices.
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