參數(shù)資料
型號(hào): PIC16F877A
廠商: Microchip Technology Inc.
英文描述: 40-Pin 8-Bit Enhanced FLASH Microcontroller(40引腳、8位增強(qiáng)型FLASH微控制器)
中文描述: 40引腳8位閃存微控制器增強(qiáng)(40引腳,8位增強(qiáng)型閃存微控制器)
文件頁數(shù): 26/222頁
文件大小: 4012K
代理商: PIC16F877A
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PIC16F87XA
DS39582A-page 24
Advance Information
2001 Microchip Technology Inc.
2.2.2.5
PIR1 Register
The PIR1 register contains the individual flag bits for
the peripheral interrupts.
Note:
Interrupt flag bits are set when an interrupt
condition occurs, regardless of the state of
its corresponding enable bit or the global
enable bit, GIE (INTCON<7>). User soft-
ware should ensure the appropriate interrupt
bits are clear prior to enabling an interrupt.
REGISTER 2-5:
PIR1 REGISTER (ADDRESS 0Ch)
R/W-0
PSPIF
(1)
bit 7
R/W-0
ADIF
R-0
RCIF
R-0
TXIF
R/W-0
SSPIF
R/W-0
CCP1IF
R/W-0
TMR2IF
R/W-0
TMR1IF
bit 0
bit 7
PSPIF:
Parallel Slave Port Read/Write Interrupt Flag bit
(1)
1
= A read or a write operation has taken place (must be cleared in software)
0
= No read or write has occurred
Note 1:
PSPIF is reserved on PIC16F873A/876A devices; always maintain this bit clear.
bit 6
ADIF
: A/D Converter Interrupt Flag bit
1
= An A/D conversion completed
0
= The A/D conversion is not complete
RCIF
: USART Receive Interrupt Flag bit
1
= The USART receive buffer is full
0
= The USART receive buffer is empty
TXIF
: USART Transmit Interrupt Flag bit
1
= The USART transmit buffer is empty
0
= The USART transmit buffer is full
SSPIF
: Synchronous Serial Port (SSP) Interrupt Flag bit
1
= The SSP interrupt condition has occurred, and must be cleared in software before returning
from the Interrupt Service Routine. The conditions that will set this bit are:
SPI
- A transmission/reception has taken place.
I
2
C Slave
- A transmission/reception has taken place.
I
2
C Master
- A transmission/reception has taken place.
- The initiated START condition was completed by the SSP module.
- The initiated STOP condition was completed by the SSP module.
- The initiated Restart condition was completed by the SSP module.
- The initiated Acknowledge condition was completed by the SSP module.
- A START condition occurred while the SSP module was idle (Multi-Master system).
- A STOP condition occurred while the SSP module was idle (Multi-Master system).
0
= No SSP interrupt condition has occurred
CCP1IF
: CCP1 Interrupt Flag bit
Capture mode:
1
= A TMR1 register capture occurred (must be cleared in software)
0
= No TMR1 register capture occurred
Compare mode:
1
= A TMR1 register compare match occurred (must be cleared in software)
0
= No TMR1 register compare match occurred
PWM mode:
Unused in this mode
TMR2IF
: TMR2 to PR2 Match Interrupt Flag bit
1
= TMR2 to PR2 match occurred (must be cleared in software)
0
= No TMR2 to PR2 match occurred
TMR1IF
: TMR1 Overflow Interrupt Flag bit
1
= TMR1 register overflowed (must be cleared in software)
0
= TMR1 register did not overflow
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
Legend:
R = Readable bit
- n = Value at POR
W = Writable bit
1
= Bit is set
U = Unimplemented bit, read as
0
0
= Bit is cleared
x = Bit is unknown
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