About Turn On Power Supply After Turn Off; After Reset Release - Toshiba TXZ+ Series Reference Manual

3.2.5. About turn on power supply after turn off

(1) When using external reset circuit or internal LVD reset output
When the power supply is turned off and the power supply voltage drops below the operation guaranteed
voltage, reset is performed with an external reset circuit or built-in LVD (when the voltage is less than the
set voltage). After that, from the state where the reset is applied, please follow the same constraints as when
turning on the power and turned on the power supply voltage.
(2) When not using external reset circuit and internal LVD reset output
When the power supply is turned off and the power supply voltage drops below the operation guaranteed
voltage, be sure to lower the power supply voltage below the Power On Reset detection voltage (V
hold it for 200 µs or more. After that, please follow the same constraints as when turning on the power and
turned on the power supply voltage.
When the power supply voltage drops below the Power On Reset detection voltage (V
held for 200 µs or more, or when the same constraints as at power on cannot keep, the MCU may not
operate properly.

3.2.6. After reset release

All of the control register of the Cortex-M4 processor with FPU and the peripheral function control register (SFR)
are initialized by reset. But depend on the reset factor, initialized range is different.
Please refer to "Table 3.1 The reset factor and the range initialized" for the initialized range by each reset factor.
The reset factor when reset occurs can be checked by a reset flag register which are [RLMRSTFLG0] and
[RLMRSTFLG1]. For details of [RLMRSTFLG0] and [RLMRSTFLG1], please refer to the reference manual
"Exception".
After reset is released, CPU starts operation by a clock of Internal High Speed Oscillator1 (IHOSC1). External
clock and PLL multiple circuit should be set if necessary.
Clock Control and Operation Mode
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TXZ+ Family
TMPM4K Group(2)
) and
PDET
) and cannot be
PDET
2021-06-15
Rev. 1.1