Power On Reset Circuit; Operation At The Time Of A Power On; Operation At The Time Of Turn Off; Figure 3.9 Power On Reset Circuit - Toshiba TXZ+ Series Reference Manual
32-bit risc microcontroller, clock control and operation mode cg-m4g(1)-c
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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 DVDD3(= DVDD3A= DVDD3B= DVDD3C= DVDD3D= DVDD3E=
DVDD3F= DVDD3G= DVDD3H).
Supply voltage
Detection
Voltage
generation
circuit
Operation at the time of a power on
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 detail.
While the Power On Reset signal is generated, the reset is asserted to the CPU and the peripherals.
Operation at the time of turn off
When turn off power supply, while 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.
Comparator
-
+
Reference voltage
generation circuit
Figure 3.9 Power On Reset Circuit
83 / 88
TMPM4G Group(1)
Clock Control and Operation Mode
Power on
Reset detection
PORHV
TXZ+ Family
2021-06-30
Rev. 1.1
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