CMOSTEK NextGenRF CMT2189B, User Manual

Page: 40 / 91

AN201
Rev 1.5 | 40/91 www.cmostek.com
4.1.8 PIR1 (Addr:0x0C)
Table 39. PIR1 Register
Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
PIR1 EEIF CKMEAIF - C2IF C1IF OSFIF TMR2IF -
Reset 0 0 - 0 0 0 0 -
Type RW RW - RW RW RW RW -
Table 40. PIR1 Bit Function Description
1 INTF
PA2/INT external interrupt flag bit.
1 = PA2/INT external interrupt occurs (must be cleared by software)
0 = PA2/INT external interrupt does not occur
0 PAIF
PORTA change interrupt flag bit.
1 = one or more ports of PORTA<7:0> have state change (must be cleared in software)
0 = none of the PORTA<7:0> has state change
Bit Name Function
7 EEIF
EEPROM write operation interrupt flag bit.
1 = EE write operation completes (must be cleared in software)
0 = EE write operation does not complete
6 CKMEAIF
Interrupt flag bit for the operation of fast clock measuring slow clock
1 = the operation of fast clock measuring slow clock completes (must be cleared in software.)
0 = the operation of fast clock measuring slow clock does not complete
5 - Reserved bit, cannot be written to 1
4 C2IF
Comparator 2 interrupt flag bit.
1 = comparator 2 output changes
0 = comparator2 output does not change
3 C1IF
Comparator 1 interrupt flag bit.
1 = comparator 1 output changes
0 = comparator 1 output does not change
2 OSFIF
Oscillator failure interrupt flag bit.
1 = system oscillator fails and clock input switches to INTOSC (must be cleared by software)
0 = system clock runs normally
1 TMR2IF
Timer 2 and PR2 compare matching interrupt flag bit.
1 = Timer 2 and PR2 matching occurs (must be cleared by software)
0 = Timer 2 and PR2 matching does not occur
0 - Reserved bit, cannot be written to 1.