MB91F587L datasheet(128/177 Pages) SPANSION

128 / 177 page

D at aS h ee t

August 22, 2014, MB91F587LA_DS705-00012-2v0-E

125

CONFIDENTIAL

•

Guaranteed operation range

Internal operation clock frequency vs. Power supply voltage

Internal operation clock frequency FCP (MHz)

128

3.7

5.5

MB91F58x guaranteed

operation range

PLL guaranteed

operation range

4.5

MB91F58x recommended

guaranteed operation range

Note: The CPU will be reset at the power supply voltage of the low-voltage detection setting

voltage or less.

Oscillation clock frequency vs. Internal operation clock frequency

Internal operation clock frequency

Main

clock

PLL clock

Multipli

ed by 1

Multipli

ed by 2

Multipli

ed by 3

Multipli

ed by 4 ...

Multiplied

by 20

... Multiplied

by 32

Oscillation clock

frequency

4MHz 2MHz 4MHz

8MHz

12MHz 16MHz ... 80MHz

...

128MHz

•

Example of oscillation circuit

R=330Ω

C2=12pF

C1=12pF

4MHz

Note: If it is impossible to start the oscillation within or equal to 20ms when starting from the

oscillation stop state, the clock supervisor performs a detection of oscillation stop and moves

to the fail safe operation.

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

In addition, when configuring the oscillator circuit, it is recommended to ask matching

evaluation of the circuit to oscillator manufacturers for the design.

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