SFR explanation for PIC16F877(2)

PIR1 ( Peripheral Interrupt register ) 0Ch

This register contains various preipheral interrupts.

The value in the parenthesis is in the condition immediately after the turning on.

PSPIF : Parallel Slave Port Read/Write Interrupt Flag

	1	:	A read or a write operation has taken place (must be cleared in software)
	0	:	No read or write has occurred

ADIF : A/D Converter Interrupt Flag

	1	:	A/D conversion completed
	0	:	A/D conversion is not complete

RCIF : USART Receive Interrupt Flag

	1	:	USART receive buffer is full
	0	:	USART receive buffer is empty

TXIF : USART Transmit Interrupt Flag

	1	:	USART transmit buffer is empty
	0	:	USART transmit buffer is full

SSPIF : Synchronous Serial Port(SSP) Interrupt Flag

	1	:	SSP interrupt condition has occurred ( must be cleared in software )
	0	:	No SSP interrupt condition occurred

CCP1IF : CCP1 Interrupt Flag

Capture Mode

	1	:	TMR1 register capture occurred ( must be cleared in software )
	0	:	No TMR1 register cpature occurred

Compare Mode

	1	:	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

	1	:	TMR2 to PR2 match occurred ( must be cleared in software )
	0	:	No TMR2 to PR2 match occurred

TMR1IF : TMR1 Overflow Interrupt Flag

	1	:	TMR1 register overflowed ( must be cleared in software )
	0	:	TMR1 register did not overflow