Information

PIC16(L)F1826/1827
DS80000485L-page 4  2009-2013 Microchip Technology Inc.
4. Module: Oscillator
4.1 HS Oscillator Frequency
The Standard Operating Conditions for the HS
Oscillator are as follows:
Work around
None.
Affected Silicon Revisions
4.2 OSCSTAT bits: HFIOFR and HFIOFS
When HFINTOSC is selected, the HFIOFR and
HFIOFS bits will become set when the oscillator
becomes ready and stable. Once these bits are
set, they become “stuck”, indicating that
HFINTOSC is always ready and stable. If the
HFINTOSC is disabled, the bits fail to be cleared.
Work around
None.
Affected Silicon Revisions
4.3 Oscillator Start-up Timer (OST) bit
During the Two-Speed Start-up sequence, the
OST is enabled to count 1024 clock cycles. After
the count is reached, the OSTS bit is set and the
system clock is held low until the next falling edge
of the external crystal (LP, XT or HS mode), before
switching to the external clock source.
When an external oscillator is configured as the
primary clock and Fail-Safe Clock mode is enabled
(FCMEN = 1), any of the following conditions will
result in the Oscillator Start-up Timer (OST) failing
to restart:
•MCLR
Reset
• Wake from Sleep
• Clock change from INTOSC to Primary Clock
This anomaly will manifest itself as a clock failure
condition for external oscillators, which takes
longer than the clock failure time-out period to
start.
Work around
None.
Affected Silicon Revisions
Characteristic Min. Typ† Max. Units Conditions Operating Temperature
Oscillator Frequency 1 — 20 MHz HS Oscillator mode, V
DD > 2.3V -40°C  TA  +85°C
Oscillator Frequency 1 — 20 MHz HS Oscillator mode, VDD  2.8V -40°C  TA  +125°C
A2 A3 A4 A5 A6
X XXXX
A2 A3 A4 A5 A6
X XXXX
A2 A3 A4 A5 A6
X XXX