Fujitsu F2MC-16LX Hardware Manual page 121

Mb90470 series 16-bit microcontroller

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Figure 4.2-1 Waiting times to stable oscillation for evaluation devices/FLASH devices and mask devices

Evaluation device/FLASH device

CPU operation

CPU operation

HCLK: Oscillation clock

Ceramic and crystal oscillators generally require a waiting time ranging from several

milliseconds to several ten milliseconds after the start of oscillation until oscillation stabilizes

at a specific frequency. Therefore, specify a oscillation stabilization wait time suitable for the

oscillator used.

Refer to Section 5.5 "Oscillation Stabilization Wait Time", for more information.

I Reset state waiting for stable oscillation

A reset during the power-on sequence and a reset in response to a reset request in the stop

and sub-clock modes is performed after the end of the oscillation stabilization wait time created

by the timebase timer. In this event, a reset is performed after an external reset is canceled

unless external reset input is cleared.

during power-on reset

Stabilization

stabilization

of regulator

oscillation stabilization

CHAPTER 4 RESET