Notes On Resets; Power Supply Rising Gradient; Power-On Reset - Renesas M16C/64A Series User Manual

M16C/64A Group
6.5

Notes on Resets

6.5.1

Power Supply Rising Gradient

When supplying power to the MCU, make sure that the power supply voltage applied to the VCC1 pin
meets the SVCC conditions.
Symbol
Power supply V
(Voltage range: 0 to 2.0 V)
SV
CC
Power supply V
(Voltage range: 2.0 V to V
VCC1
[V]
5.0
2.0
Figure 6.7 SVCC Timing (3.6 V < VCC1)
VCC1
[V]
3.0
2.0
Figure 6.8 SVCC Timing (VCC1
6.5.2

Power-On Reset

Use the voltage monitor 0 reset together with the power-on reset. To use the power-on reset, set the
LVDAS bit in the OFS1 address to 0 (voltage monitor 0 reset enabled after hardware reset) and the
VDSEL1 bit to 0 (Vdet0_2). In this case, the voltage monitor 0 reset is enabled (the VW0C0 bit and bit 6
in the VW0C register are 1, and the VC25 bit in the VCR2 register is 1) after power-on reset. Do not
disable these bits by a program.
R01UH0136EJ0210 Rev.2.10
Jul 31, 2012
Parameter
rising gradient
CC1
rising gradient
CC1
)
CC1
Power-on
0
Power-on
0
≤
3.6 V)
Min.
0.05
≤ 5.5 V
3.6 V < V
CC1
Maximum value of SVCC
(2.0 V to VCC1)
Minimum value of SVCC
(0 V to 2 V)
Minimum value of SVCC
(0 V to 2 V)
6. Resets
Standard
Unit
Typ. Max.
V/ms
5.5 V/ms
Time
Time
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