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參數(shù)資料
| 型號(hào)： | 12CE673 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | HookUp/Lead Wire; Conductor Size AWG:18; No. Strands x Strand Size:65 x 36; Jacket Color:Black; Conductor Material:Copper; Jacket Material:Rubber; Leaded Process Compatible:Yes; Number of Conductors:1; Outer Diameter:0.144" RoHS Compliant: Yes |
| 中文描述： | 8引腳，8位CMOS微控制器與A / D轉(zhuǎn)換器和EEPROM數(shù)據(jù)存儲(chǔ)器 |
| 文件頁數(shù)： | 54/116頁 |
| 文件大?。?/td> | 671K |
| 代理商： | 12CE673 |
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PIC12CE67X
DS40181B-page 54
Preliminary
1998 Microchip Technology Inc.
9.5
There are four sources of interrupt:
Interrupts
The interrupt control register (INTCON) records individ-
ual 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 un-masked 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 vari-
ous registers. Individual interrupt bits are set
regardless of the status of the GIE bit. The GIE bit is
cleared on reset.
Interrupt Sources
TMR0 overflow interrupt
External interrupt GP2/INT pin
GPIO Port change interrupts (pins GP0, GP1, GP3)
A/D Interrupt
Note:
Individual interrupt flag bits are set regard-
less of the status of their corresponding
mask bit or the GIE bit.
The “return from interrupt” instruction,
RETFIE
, exits
the interrupt routine as well as sets the GIE bit, which
re-enables interrupts.
The GP2/INT, GPIO port change interrupt and the
TMR0 overflow interrupt flags are contained in the
INTCON register.
The peripheral interrupt flag ADIF, is contained in the
special function register PIR1. The corresponding
interrupt enable bit is contained in special function reg-
ister PIE1, 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 GPIO change
interrupt, the interrupt latency will be three or four
instruction cycles. The exact latency depends when the
interrupt event occurs (Figure 8-15). The latency is the
same for one or two cycle instructions. Individual inter-
rupt flag bits are set regardless of the status of their
corresponding mask bit or the GIE bit.
FIGURE 9-14: INTERRUPT LOGIC
GPIF
GPIE
T0IF
T0IE
GIE
Wakeup
(If in SLEEP mode)
Interrupt to CPU
PEIE
ADIF
ADIE
INTF
INTE
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