PIC16F87 datasheet(21/230 Pages) MICROCHIP

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DS30487D-page 21

PIC16F87/88

2.2.2.5

PIR1 Register

This register contains the individual flag bits for the

peripheral interrupts.

PIR1: PERIPHERAL INTERRUPT REQUEST (FLAG) REGISTER 1 (ADDRESS 0Ch)

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

software should ensure the appropriate

interrupt flag bits are clear prior to

enabling an interrupt.

U-0

R/W-0

R-0

R/W-0

—ADIF(1)

RCIF

TXIF

SSPIF

CCP1IF

TMR2IF

TMR1IF

bit 7

bit 0

bit 7

Unimplemented: Read as ‘0’

bit 6

ADIF: A/D Converter Interrupt Flag bit(1)

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

= The A/D conversion is not complete

Note 1: This bit is only implemented on the PIC16F88. The bit will read ‘0’ on the PIC16F87.

bit 5

RCIF: AUSART Receive Interrupt Flag bit

= The AUSART receive buffer is full (cleared by reading RCREG)

= The AUSART receive buffer is not full

bit 4

TXIF: AUSART Transmit Interrupt Flag bit

= The AUSART transmit buffer is empty (cleared by writing to TXREG)

= The AUSART transmit buffer is full

bit 3

SSPIF: Synchronous Serial Port (SSP) Interrupt Flag bit

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

= Waiting to transmit/receive

bit 2

CCP1IF: 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 Interrupt Flag bit

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

= No TMR2 to PR2 match occurred

bit 0

TMR1IF: TMR1 Overflow Interrupt Flag bit

= The TMR1 register overflowed (must be cleared in software)

= The TMR1 register did not overflow

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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