Fujitsu F2MC-8L F202RA Hardware Manual page 60

CHAPTER 3 CPU
● Power-on reset
Power-on reset occurs when power is turned on. Power-on reset occurs after oscillation stabilization wait
time has expired.
Power-on reset requires an external reset circuit.
■
Reset Sources and Oscillation Stabilization Wait Time
Operations in oscillation stabilization wait time depend on the operating mode used when a reset occurs.
After a reset, active mode is set regardless of the operating mode applied before the reset (standby mode)
and reset source. Therefore, if a reset occurs while oscillation is being stopped or within the oscillation
stabilization wait time, the oscillation stabilization wait reset mode is set.
Software reset and watchdog reset do not apply oscillation stabilization wait time.
Table 3.5-2 shows the relationship between reset sources, oscillation stabilization wait time, and the reset
operation (mode fetch).
Table 3.5-2 Relationship between the Reset Sources and Oscillation Stabilization Wait Time
Reset source
*
External reset
Software reset and
watchdog reset
Power-on reset
* External reset in active mode does not apply oscillation stabilization wait time. The reset operation is performed after
cancellation of external reset.
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Operating mode
When power is
The reset operation is performed when external reset is cancelled after
turned on or stop
oscillation stabilization wait time has expired.
mode
The reset operation is performed following the generation of a 4-
Active mode
instruction cycle reset.
When power is The reset operation is performed after power is turned on and
turned on oscillation stabilization wait time has expired.
Reset operation and oscillation stabilization wait time