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User’s Manual U14492EJ3V0UD
CHAPTER 17 TURNING ON/OFF POWER
The V850E/IA1 has three types of power supply pins: 3.3 V power supply pins for internal units (V
DD3
and CV
DD
), 5
V power supply pins for external pins (V
DD5
and AV
DD
), and a flash programming power supply pin (V
PP
)
Note
.
This chapter explains the I/O pin status when power is turned ON/OFF.
Note
µ
PD70F3116 only
[Recommended timing of turning ON/OFF power]
•
To turn ON
Keep the voltage on the V
DD5
and AV
DD
pins at 0 V until the voltage on the V
DD3
pin rises to the level at which
the operation is guaranteed (3.0 to 3.6 V).
•
To turn OFF
Keep the voltage on the V
DD3
pin at the level at which the operation is guaranteed (3.0 to 3.6 V), until the voltage
on the V
DD5
and AV
DD
pins has dropped to 0 V.
•
When releasing reset status by RESET pin
Release the reset status by the RESET pin after both the 3.3 V power supply and 5 V power supply have risen.
Figure 17-1. Recommended Timing of Turning ON/OFF Power
Depends on program setting
I/O pin
V
DD3
V
DD5
, AV
DD
0 V
3.0 V
4.5 V
3.0 V
4.5 V
0 V
0 V
0 V
RESET (input)
Remark
The broken line indicates a high-impedance state.