R01DS0012EJ0110_15 Datasheet, PDF (51/70 Pages) Renesas Technology Corp – RENESAS MCU

R8C/34W Group, R8C/34X Group, R8C/34Y Group, R8C/34Z Group
5. Electrical Characteristics
Table 5.10 Power-on Reset Circuit, Voltage Monitor 0 Reset Electrical Characteristics ⁽²⁾
Symbol
trth
Parameter
External power VCC rise gradient
Condition
(1)
Standard
Unit
Min. Typ. Max.
0
− 50000 mV/msec
Notes:
1. The measurement condition is VCC = 2.7 V to 5.5 V and Topr = −40 to 85°C (J version) / −40 to 125°C (K version).
2. To use the power-on reset function, enable voltage monitor 0 reset by setting the LVDAS bit in the OFS register to 0.
Vdet0 ⁽¹⁾
External
Power VCC
0.5 V
trth
tw(por) ⁽²⁾
trth
Voltage detection 0
circuit response time
Vdet0 ⁽¹⁾
Internal
reset signal
1
fOCO-S
× 32
1
fOCO-S
× 32
Notes:
1. Vdet0 indicates the voltage detection level of the voltage detection 0 circuit. Refer to 6. Voltage Detection
Circuit of User’s Manual: Hardware (R01UH0063EJ) for details.
2. tw(por) indicates the duration the external power VCC must be held below the valid voltage (0.5 V) to
enable a power-on reset. When turning on the power after it falls with voltage monitor 0 reset disabled,
maintain tw(por) for 1 ms or more.
Figure 5.3 Power-on Reset Circuit Electrical Characteristics
R01DS0012EJ0110 Rev.1.10
Jan 31, 2013
Page 51 of 67