MB91F522DKBPMC datasheet(144/280 Pages) CYPRESS

144 / 280 page

Document Number: 002-04662 Rev. *F

Page 144 of 280

MB91520 Series

Oscillation clock frequency vs. Internal operation clock frequency

Internal operation clock frequency

Main Clock

PLL clock

Multiplied

by 1

Multiplied

by 2

Multiplied

by 3

Multiplied

by 4

...

Multiplied

by 19

Multiplied

by 20

Oscillation

clock frequency

4 MHz

2 MHz

4 MHz

8 MHz

12 MHz

16 MHz

...

76 MHz

80 MHz

 Example of oscillation circuit

R=0Ω

C2=10pF

C1=10pF

4MHz

Note: As to the product with its clock supervisor

’s initial value is “ON”, when the oscillator is unable to start

within 20 ms from the stop state the clock supervisor will detect the oscillation stop. As a result, the CPU

moves to the fail safe operation.

Design your print circuit board so that the oscillator can start oscillation within 20 ms. Moreover, it is

recommended to be designed after the match evaluation of the circuit is requested to the departure

pendulum maker when the oscillation circuit is composed.

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