Datasheet

PIC18F2220/2320/4220/4320

9.5 RCON Register

The RCON register contains bits used to determine the

cause of the last Reset or wake-up from power-

managed mode. RCON also contains the bit that

enables interrupt priorities (IPEN).

R/W-0 U-0 U-0 R/W-1 R-1 R-1 R/W-0 R/W-0

IPEN

— —RITO PD POR BOR

bit 7 bit 0

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

bit 7 IPEN: Interrupt Priority Enable bit

1 = Enable priority levels on interrupts

0 = Disable priority levels on interrupts (PIC16CXXX Compatibility mode)

bit 6-5 Unimplemented: Read as ‘0’

bit 4 RI

: RESET Instruction Flag bit

1 = The RESET instruction was not executed (set by firmware only)

0 = The RESET instruction was executed causing a device Reset (must be set in software after a

Brown-out Reset occurs)

bit 3 TO

: Watchdog Time-out Flag bit

1 = Set by power-up, CLRWDT instruction or SLEEP instruction

0 = A WDT time-out occurred

bit 2 PD

: Power-Down Detection Flag bit

1 = Set by power-up or by the CLRWDT instruction

0 = Cleared by execution of the SLEEP instruction

bit 1 POR

: Power-on Reset Status bit

1 = A Power-on Reset has not occurred (set by firmware only)

0 = A Power-on Reset occurred (must be set in software after a Power-on Reset occurs)

bit 0 BOR

: Brown-out Reset Status bit

1 = A Brown-out Reset has not occurred (set by firmware only)

0 = A Brown-out Reset occurred (must be set in software after a Brown-out Reset occurs)