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PIC16F688-I/ML bảng dữ liệu(PDF) 28 Page - Microchip Technology

tên linh kiện PIC16F688-I/ML
Giải thích chi tiết về linh kiện  14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
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PIC16F688-I/ML bảng dữ liệu(HTML) 28 Page - Microchip Technology

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PIC16F688
DS41203E-page 26
© 2009 Microchip Technology Inc.
3.5.2.1
OSCTUNE Register
The HFINTOSC is factory calibrated but can be
adjusted in software by writing to the OSCTUNE
register (Register 3-2).
The default value of the OSCTUNE register is ‘0’. The
value is a 5-bit two’s complement number.
When
the
OSCTUNE
register
is
modified,
the
HFINTOSC frequency will begin shifting to the new
frequency. 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 3-2:
OSCTUNE: OSCILLATOR TUNING REGISTER
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
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
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



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