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PIC18F6585/8585/6680/8680

DS30491C-page 114

2004 Microchip Technology Inc.

9.2

PIR Registers

The PIR registers contain the individual flag bits for the

peripheral interrupts. Due to the number of peripheral

interrupt sources, there are three Peripheral Interrupt

Flag registers (PIR1, PIR2 and PIR3).

REGISTER 9-4:

PIR1: PERIPHERAL INTERRUPT REQUEST (FLAG) REGISTER 1

Note 1: 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>).

2: User software should ensure the appropri-

ate interrupt flag bits are cleared prior to

enabling an interrupt, and after servicing

that interrupt.

R/W-0

R-0

R/W-0

PSPIF(1)

ADIF

RCIF

TXIF

SSPIF

CCP1IF

TMR2IF

TMR1IF

bit 7

bit 0

bit 7

PSPIF: Parallel Slave Port Read/Write Interrupt Flag bit(1)

= A read or a write operation has taken place (must be cleared in software)

= No read or write has occurred

bit 6

ADIF: A/D Converter Interrupt Flag bit

= An A/D conversion completed (must be cleared in software)

= The A/D conversion is not complete

bit 5

RCIF: USART Receive Interrupt Flag bit

= The USART receive buffer, RCREG, is full (cleared when RCREG is read)

= The USART receive buffer is empty

bit 4

TXIF: USART Transmit Interrupt Flag bit

= The USART transmit buffer, TXREG, is empty (cleared when TXREG is written)

= The USART transmit buffer is full

bit 3

SSPIF: Master Synchronous Serial Port Interrupt Flag bit

= The transmission/reception is complete (must be cleared in software)

= Waiting to transmit/receive

bit 2

CCP1IF: Enhanced CCP1 Interrupt Flag bit

Capture mode:

= A TMR1 register capture occurred (must be cleared in software)

= No TMR1 register capture occurred

Compare mode:

= A TMR1 register compare match occurred (must be cleared in software)

= No TMR1 register compare match occurred

PWM mode:

Unused in this mode.

bit 1

TMR2IF: TMR2 to PR2 Match Interrupt Flag bit

= TMR2 to PR2 match occurred (must be cleared in software)

= No TMR2 to PR2 match occurred

bit 0

TMR1IF: TMR1 Overflow Interrupt Flag bit

= TMR1 register overflowed (must be cleared in software)

= TMR1 register did not overflow

Note 1: Available in Microcontroller mode only.

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

- n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

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