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3.2.4. 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
3.2.4.1. Operation at the time of a power supply
When turn on power supply, while the power supply voltage is lower than Power On Reset Circuit release voltage
(V
), the Power On Reset detection signal is generated. Refer to "Figure 3.1 The reset operation by a Power
PREL
On Reset Circuit" for details.
While the Power On Reset signal is generated, the reset is asserted to the CPU and the peripherals.
3.2.4.2. Operation at the time of turn off
When turn off power supply or when the power supply voltage is 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
64 / 68
TXZ+ Family
TMPM4K Group(2)
PORHV
2023-12-25
Rev. 3.0
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