PIC16F819 Datasheet

IC型号：
PIC16F819
PDF描述：
18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Tech...
文件大小：
68.31KB
PDF页数：
176页
芯片厂家：
MICROCHIP

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PIC16F818/819

4.5.2

OSCTUNE REGISTER

The internal oscillator鈥檚 output has been calibrated at the

factory but can be adjusted in the application. This is

done by writing to the OSCTUNE register (Register 4-1).

The tuning sensitivity is constant throughout the tuning

range. The OSCTUNE register has a tuning range of

卤12.5%.

When the OSCTUNE register is modified, the INTOSC

and INTRC frequencies will begin shifting to the new fre-

quency. The INTRC clock will reach the new frequency

within 8 clock cycles (approximately 8 * 32

碌s

= 256

碌s);

the INTOSC clock will stabilize within 1 ms. Code execu-

tion continues during this shift. There is no indication that

the shift has occurred. Operation of features that depend

on the 31.25 kHz INTRC clock source frequency, such

as the WDT, Fail-Safe Clock Monitor and peripherals,

will also be affected by the change in frequency.

OSCTUNE: OSCILLATOR TUNING REGISTER

U-0

鈥?/div>

bit 7

U-0

鈥?/div>

R/W-0

TUN5

R/W-0

TUN4

R/W-0

TUN3

R/W-0

TUN2

R/W-0

TUN1

R/W-0

TUN0

bit 0

bit 7-6

bit 5-0

Unimplemented:

Read as 鈥?鈥?/div>

TUN<5:0>:

Frequency Tuning bits

011111

= Maximum frequency

011110

鈥?/div>

000001

000000

= Center frequency. Oscillator module is running at the calibrated frequency.

111111

鈥?/div>

100000

= Minimum frequency

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

鈥?鈥?= Bit is set

U = Unimplemented bit, read as 鈥?鈥?/div>

鈥?鈥?= Bit is cleared

x = Bit is unknown

DS39598D-page 36

Preliminary

铮?/div>

2003 Microchip Technology Inc.

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