Datasheet

PIC18F1220/1320
DS39605F-page 56 © 2007 Microchip Technology Inc.
5.14 RCON Register
The Reset Control (RCON) register contains flag bits
that allow differentiation between the sources of a
device Reset. These flags include the TO
, PD, POR,
BOR
and RI bits. This register is readable and writable.
REGISTER 5-3: RCON REGISTER
Note 1: If the BOR configuration bit is set (Brown-
out Reset enabled), the BOR
bit is ‘1’ on
a Power-on Reset. After a Brown-out
Reset has occurred, the BOR bit will be
cleared and must be set by firmware to
indicate the occurrence of the next
Brown-out Reset.
2: It is recommended that the POR
bit be set
after a Power-on Reset has been
detected, so that subsequent Power-on
Resets may be detected.
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
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)
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