Toshiba H1 Series Data Book page 20

This LSI has the restriction for the order of supplying power. Be sure to supply external
3.3V power with 1.5V power is supplied.
Power On
DVCC1A
1.5V
DVCC1B
Power
DVCC1C
After 1.5V power
supply is rising,
set 3.3V to ON.
3.3V
DVCC3A
Power
DVCC3B
AVCC
RESET
PWE terminal
Note1: Inernal 1.5 V and External 3.3V power supply can be set to ON/OFF at the same time. However, external pin
may become unstable condition momentary. Therefore, set external power supply to ON/OFF during internal
power supply is stabile like above figure if there is possibility to affect machinery connected with micro controller.
Note2: When setting to ON, don't set 3.3V power supply earlier than 1.5V power supply. When setting to OFF, don't
set to 3.3V power supply later than 1.5 V power supply.
Power supply is rising with
in 100mS, and stabilizes.
High-frequency oscillation
stabilization time
＋20 system clock
Figure 3.1.2 Power on Reset Timing Example
92CZ26A-17
Stand-by Mode (PMC)
Power supply is falling with
in 100mS, and stabilizes.
TMP92CZ26A
Power Off
After 1.5V power
supply is falling, set
3.3V to OFF.