PIC16LC774-04SLASHSS datasheet(20/200 Pages) MICROCHIP

20 / 200 page

PIC16C77X

DS30275A-page 20

Advance Information

2.2.2.5

PIR1 REGISTER

This register contains the individual flag bits for the

peripheral interrupts.

FIGURE 2-7:

PIR1 REGISTER (ADDRESS 0Ch)

Note:

Interrupt flag bits get 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 inter-

rupt flag bits are clear prior to enabling an

interrupt.

R/W-0

R-0

R/W-0

PSPIF(1)

ADIF

RCIF

TXIF

SSPIF

CCP1IF

TMR2IF

TMR1IF

= Readable bit

W = Writable bit

= Unimplemented bit,

read as ‘0’

- n = Value at POR reset

bit7

bit0

bit 7:

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

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

0 = No read or write has occurred

bit 6:

ADIF: A/D Converter Interrupt Flag bit

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

0 = The A/D conversion is not complete

bit 5:

RCIF: USART Receive Interrupt Flag bit

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

0 = The USART receive buffer is empty

bit 4:

TXIF: USART Transmit Interrupt Flag bit

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

0 = The USART transmit buffer is full

bit 3:

SSPIF: Synchronous Serial Port Interrupt Flag bit

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

0 = Waiting to transmit/receive

bit 2:

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

bit 1:

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

bit 0:

TMR1IF: TMR1 Overflow Interrupt Flag bit

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

0 = TMR1 register did not overflow

Note 1: PSPIF is reserved on the 28-pin devices, always maintain this bit clear.

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