Power-On Sequence When Not Using Ram Backup - Renesas M32R/ECU Series User Manual

20
20.2 Power-On Sequence

20.2.1 Power-On Sequence when Not Using RAM Backup

The diagram below shows a turn-on sequence of the power supply (5.0 V or 3.3 V) when not using RAM backup.
VCCE,VDDE
VCC-BUS,
0V
OSC-VCC
0V
AVCC
0V
VREF
0V
RESET#
Note 1: After turning on all power supplies and holding the RESET# pin low for an oscillation stabilization time,
release the RESET# pin back high (to deassert the reset input).
Notes: • Power-on limitations
VCCE = OCS-VCC
VDDE ≥ VCCE, OSC-VCC
• However, if the above power-on limitations cannot be met, sufficient evaluation must be made during system design
in order to ensure that no power will be applied to the microcomputer with a potential difference of 1 V or more.
For potential differences 0 V to 0.6 V, there is almost no in-flow current. The amount of in-flow current begins to increase
when the potential difference exceeds 0.6 V.
Figure 20.2.1 Power-On Sequence when Not Using RAM Backup
(Note 1)
20-3
POWER SUPPLY CIRCUIT
20.2 Power-On Sequence
32180 Group User's Manual (Rev.1.0)