Datasheet

PIC18FXX8
DS41159E-page 58 © 2006 Microchip Technology Inc.
4.14 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 4-3: RCON: RESET CONTROL REGISTER
Note 1: If the BOREN configuration bit is set,
BOR
is ‘1’ on Power-on Reset. If the
BOREN configuration bit is clear, BOR
is
unknown on Power-on Reset.
The BOR status bit is a “don’t care” and is
not necessarily predictable if the brown-
out circuit is disabled (the BOREN config-
uration bit is clear). BOR
must then be set
by the user and checked on subsequent
Resets to see if it is clear, indicating a
brown-out has occurred.
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/W R/W 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
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 = After power-up, CLRWDT instruction or SLEEP instruction
0 = A WDT time-out occurred
bit 2 PD
: Power-down Detection Flag bit
1 = After power-up or by the CLRWDT instruction
0 = By execution of the SLEEP instruction
bit 1 POR
: Power-on Reset Status bit
1 = A Power-on Reset has not occurred
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
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