PIC18F2220/2320/4220/4320
5.14 RCON Register
Note 1: If the BOREN configuration bit is set
(Brown-out Reset enabled), the BOR bit
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.
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.
REGISTER 5-3:
RCON REGISTER
R/W-0
IPEN
U-0
—
U-0
—
R/W-1
RI
R-1
TO
R-1
PD
R/W-0
POR
R/W-0
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: RESETInstruction Flag bit
1= The RESETinstruction was not executed (set by firmware only)
0= The RESETinstruction was executed causing a device Reset (must be set in software after
a Brown-out Reset occurs)
bit 3
bit 2
bit 1
bit 0
TO: Watchdog Time-out Flag bit
1= Set by power-up, CLRWDTinstruction or SLEEPinstruction
0= A WDT time-out occurred
PD: Power-down Detection Flag bit
1= Set by power-up or by the CLRWDTinstruction
0= Cleared by execution of the SLEEPinstruction
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)
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
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
- n = Value at POR
2003 Microchip Technology Inc.
DS39599C-page 69
MICROCHIP [ MICROCHIP ]
