MC68181 Datasheet, PDF (26/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

MC68181
Freescale Semiconductor, Inc.
Application Design Considerations
Figure 4-2 shows a recommended circuit for a 76.8 kHz crystal input.
EXTAL
Ex: UT200 Crystal Sanyo
R2
10 MΩ
C1
10 pF
R1
0Ω
XTAL
C2
10 pF
Note: R1 can be increased in size to be used as a current limiter, if needed.
Figure 4-2 Input Circuit for 76.8 kHz Crystal
AA1069
Appendix A of this document provides a background of the FLEX signal protocol.
Appendix B provides a description of the way in which the MC68181 FLEX™ chip IC
handles packets through the SPI, including sections that describe transfer from the
host to the decoder from the decoder to the host. Appendix C provides a sample
application to illustrate how the MC68181 FLEX™ chip IC might be used in an
application.
4-4
MC68181 Technical Data Sheet
MOTOROLA
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