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PIC18F8620 Datasheet

  • PIC18F8620

  • 64/80-Pin High-Performance,256 Kbit to 1 Mbit Enhanced Flash...

  • 3273.72KB

  • 380頁

  • Microchip   Microchip

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PIC18F6520/8520/6620/8620/6720/8720
2.6
Oscillator Switching Feature
The PIC18FXX20 devices include a feature that allows
the system clock source to be switched from the main
oscillator to an alternate low-frequency clock source.
For the PIC18FXX20 devices, this alternate clock
source is the Timer1 oscillator. If a low-frequency
crystal (32 kHz, for example) has been attached to the
Timer1 oscillator pins and the Timer1 oscillator has
been enabled, the device can switch to a low-power
execution mode. Figure 2-7 shows a block diagram of
the system clock sources. The clock switching feature
is enabled by programming the Oscillator Switching
Enable (OSCSEN) bit in Configuration Register 1H to a
鈥?鈥? Clock switching is disabled in an erased device.
See
Section 12.0 鈥淭imer1 Module鈥?/span>
for further details
of the Timer1 oscillator. See
Section 23.0 鈥淪pecial
Features of the CPU鈥?/span>
for Configuration register
details.
FIGURE 2-7:
DEVICE CLOCK SOURCES
PIC18FXX20
Main Oscillator
OSC2
Sleep
OSC1
Timer1 Oscillator
T1OSO
T1OSCEN
Enable
Oscillator
Clock Source Option
for other Modules
4 x PLL
T
OSC
T
T
1
P
T
OSC
/4
T
SCLK
T1OSI
Clock
Source
MUX
DS39609B-page 24
錚?/div>
2004 Microchip Technology Inc.

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