Information

PIC16(L)F1826/1827
DS80000485L-page 8  2009-2013 Microchip Technology Inc.
9. Module: BOR
9.1 BOR Reset
This issue affects only the PIC16LF1826/1827
devices. The device may undergo a BOR Reset
when waking-up from Sleep and BOR is re-
enabled. A BOR Reset may also occur the
moment the software BOR is enabled.
Under certain voltage and temperature conditions
and when either SBODEN or BOR_NSLEEP is
selected, the devices may occasionally Reset
when waking-up from Sleep or BOR is enabled.
Work around
Method 1: In applications where BOR use is
not critical, turn off the BOR in the
Configuration Word.
Method 2: Set the FVREN bit of the
FVRCON register. Maintain this
bit on at all times.
Method 3: When BOR module is needed
only during run-time, use the
software-enabled BOR by setting
the SBODEN option on the
Configuration Word. BOR should
be turned off by software before
Sleep, then follow the below
sequence for turning BOR on
after Wake-up:
a. Wake-up event occurs;
b. Turn on FVR (FVREN bit of the
FVRCON register);
c. Wait until FVRRDY bit is set;
d. Wait 15 µs after the FVR
Ready bit is set;
e. Manually turn on the BOR.
Method 4: Use the software-enabled BOR
as described in Method 3, but use
the following sequence:
a. Switch to internal 32 kHz
oscillator immediately before
Sleep;
b. Upon wake-up, turn on FVR
(FVREN bit of the FVRCON
register);
c. Manually turn on the BOR;
d. Switch the clock back to the
preferred clock source.
Affected Silicon Revisions
Note: When using the software BOR, follow the
steps in Methods 3 or 4 above when
enabling BOR for the first time during
program execution.
A2 A3 A4 A5 A6
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