Datasheet

R8C/M11A Group, R8C/M12A Group 4. Electrical Characteristics
R01DS0010EJ0200 Rev.2.00 Page 30 of 45
May 31, 2012
Notes:
1. The measurement condition is Topr = -20
°C to 85 °C (N version)/-40 °C to 85 °C (D version), unless otherwise specified.
2. To use the power-on reset function, enable the voltage monitor 0 reset by setting the LVDAS bit in the OFS register to 0.
Figure 4.3 Power-On Reset Circuit Electrical Characteristics
Table 4.9 Power-On Reset Circuit
(2)
Symbol Parameter Condition
Standard
Unit
Min. Typ. Max.
t
rth External power Vcc rise gradient 0 — 50,000 mV/msec
Notes:
1. Vdet0 indicates the voltage detection level of the voltage detection 0 circuit. For details, see 7. Voltage Detection Circuit
in the User’s Manual: Hardware.
2. t
w(por) is required for a power-on reset to be enabled with the external power Vcc held below the valid voltage (0.5 V) to
enable a power-on reset. When Vcc decreases with voltage monitor 0 reset disabled and then turns on, maintain t
w(por) for
1 ms or more.
Vdet0
(1)
Internal reset signal
(low active)
0.5 V
tw(por)
(2)
trth
Voltage detection 0
circuit response time
External power Vcc
trth
× 256
1
fLOCO
× 256
1
fLOCO