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PIC16F636TE/P Datasheet(PDF) 35 Page - Microchip Technology

Part # PIC16F636TE/P
Description  8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY
PDF  196 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F636TE/P Datasheet(HTML) 35 Page - Microchip Technology

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© 2005 Microchip Technology Inc.
Preliminary
DS41232B-page 33
PIC12F635/PIC16F636/639
3.4.2.1
OSCTUNE Register
The HFINTOSC is factory calibrated but can be
adjusted in software by writing to the OSCTUNE
register (Register 3-1).
The OSCTUNE register has a tuning range of
approximately
±12%.
The
default
value
of
the
OSCTUNE register is ‘0’. The value is a 5-bit two’s
complement number. Due to process variation, the
monotonicity and frequency step cannot be specified.
When
the
OSCTUNE
register
is
modified,
the
HFINTOSC frequency will begin shifting to the new
frequency. The HFINTOSC clock will stabilize within
1 ms. Code execution continues during this shift. There
is no indication that the shift has occurred.
OSCTUNE does not affect the LFINTOSC frequency.
Operation of features that depend on the LFINTOSC
clock source frequency, such as the Power-up Timer
(PWRT), Watchdog Timer (WDT), Fail-Safe Clock
Monitor (FSCM) and peripherals, are not affected by
the change in frequency.
REGISTER 3-1:
OSCTUNE – OSCILLATOR TUNING REGISTER (ADDRESS: 90h)
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
—
TUN4
TUN3
TUN2
TUN1
TUN0
bit 7
bit 0
bit 7-5
Unimplemented: Read as ‘0’
bit 4-0
TUN<4:0>: Frequency Tuning bits
01111
= Maximum frequency
01110
=
•
•
•
00001
=
00000
= Oscillator module is running at the calibrated frequency.
11111
=
•
•
•
10000
= Minimum frequency
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



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