Turning Off And Re-Turning On Power Supply; When Using External Reset Circuit Or Internal Lvd Reset Output; When Not Using External Reset Circuit And Internal Lvd Reset Output; After Reset Release - Toshiba TXZ+ TMPM4MNFYAFG Reference Manual

3.2.5. Turning off and re-turning on power supply

When a power supply is turned off, a power supply voltage must be down gentler gradient than Max value of
"Power gradient (V
POFF

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.

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
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
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 detail of [RLMRSTFLG0] and [RLMRSTFLG1], please refer to the reference manual
"Exception".
After reset is released, TXZ-MCU starts operation by a clock of Internal High Speed Oscillator1 (IHOSC1).
External clock and PLL multiple circuit should be set if necessary.
)" specified in "Electrical Characteristics".
Clock Control and Operation Mode
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TXZ+ Family
TMPM4M Group(1)
) and hold it for 200
PDET
) and cannot be held for
PDET
2022-06-24
Rev. 1.1