DS07-16303-3E Datasheet, PDF (72/97 Pages) Fujitsu Component Limited. – 32-bit RISC Microcontroller CMOS FR30 Series

MB91121
(5) Power-on Reset
Parameter
Symbol
Power supply rising time
tR
Power supply shut off time tOFF
Pin
name
VCC
VCC
(VCC = 3.0 V to 3.6 V, VSS = AVSS = 0.0 V, TA = 0 °C to + 70 °C)
Condition
Value
Min.
Max.
Unit Remarks
VCC = 3.3 V
50 µs
VCC < 0.2 V
18
ms
before the
power supply
rising

1

ms
Repeated
operations
tR
VCC
0.9 × VCC
0.2 V
tOFF
Note: Sudden change in supply voltage during operation may initiate a power-on sequence.
To change supply voltage during operation, it is recommended to smoothly raise the voltage to avoid rapid
fluctuations in the supply voltage.
VCC
A voltage rising rate of 50 mV/ms or
less is recommended.
VSS
Note: Set RST pin to ÒLÓ level when turning on the device, at least the described above duration after the
supply voltage reaches Vcc is necessary before turning the RST to ÒHÓ level.
VCC
RST
tRSTL
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