Power On Reset Circuit; Operation At The Time Of Turn On; Operation At The Time Of Turn Off; Figure 3.8 Power On Reset Circuit - Toshiba TXZ+ Series Reference Manual

3.2.5. Power On Reset Circuit

The Power On Reset Circuit (POR) generates a reset signal when the power is turned on or turned off.
Note: The Power On Reset Circuit may not operate correctly due to the fluctuation of the power supply.
Equipment should be designed with full consideration of the electrical characteristics.
The Power On Reset Circuit consists of a Detection voltage generation circuit, a Reference voltage generation
circuit, and a Comparator.
The supply voltage has referred to DVDD5 (= DVDD5A = DVDD5B).
Supply voltage

3.2.5.1. Operation at the time of turn on

When turn on power supply, while the power supply voltage is equal to or lower than Power On Reset release
voltage (V ), the Power On Reset detection signal is generated. Refer to "Figure 3.1 The reset operation by a
PREL
Power On Reset Circuit" for detail.
While the Power On Reset signal is generated, the reset is asserted to the CPU and the peripherals.

3.2.5.2. Operation at the time of turn off

When turn off power supply, after the power supply voltage is equal to or lower than Power On Reset detection
voltage (V ), the Power On Reset detection signal is generated
PDET
While the Power On Reset signal is generated, the reset is asserted to the CPU and the peripherals.
Detection
Voltage
generation
circuit
Reference voltage
generation circuit

Figure 3.8 Power On Reset Circuit

Clock Control and Operation Mode
Power on
Comparator
Reset detection
68 / 72
TXZ+ Family
TMPM3H Group(1)
PORHV
2022-05-10
Rev. 1.3