S80L186EB16 datasheet(46/85 Pages) INNOVASIC

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IA186EB/IA188EB

Data Sheet

8-Bit/16-Bit Microcontrollers

July 10, 2011

IA211080314-13

http://www.Innovasic.com

UNCONTROLLED WHEN PRINTED OR COPIED

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Page 46 of 85

1-888-824-4184

4.1.2

Clock Generator

The IA186EB/IA188EB uses an on-chip clock generator to supply internal and external clocks.

The clock generator makes use of a crystal oscillator and includes a divide-by-two counter.

Figure 11 shows the various operating modes of the clock circuit. The clock circuit can use

either a parallel resonant fundamental mode crystal network (A) or a third-overtone mode crystal

network (B), or it can be driven by an external clock source (C).

The following parameters are recommended when choosing a crystal:

Temperature Range

– Application Specific

– ESR (Equivalent Series Resistance): 40 max

– C0 (Shunt Capacitance of Crystal): 7.0 pF max

– CL (Load Capacitance): 20 pF ± 2 pF

– Drive Level: 1 mW max

Figure 11. Clock Circuit Connection Options

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