AN2690 Freescale Semiconductor / Motorola, AN2690 Datasheet - Page 17
AN2690
Manufacturer Part Number
AN2690
Description
Low Frequency EEPROM Emulation on the MC68HLC908QY4
Manufacturer
Freescale Semiconductor / Motorola
Datasheet
1.AN2690.pdf
(34 pages)
SwitchToXtal Flow
Diagram
MOTOROLA
Low Frequency EEPROM Emulation on the MC68HLC908QY4
This function switches the oscillator source from the internal 4 MHz oscillator to
the external 32768 Hz oscillator, which is used to drive the application.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
Figure 9. Switch to External Crystal
N
N
Precharge External Crystal circuit
Enable external clock generator
Xtal Stabilization delay
External clock source
SwitchToXtal
(Set PTA4)
complete?
engaged?
RTS
Y
Y
Appendix A: Sample Application
AN2690
17
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