R8C datasheet(30/48 Pages) RENESAS

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R8C/M11A Group, R8C/M12A Group

4. Electrical Characteristics

Under development Preliminary document

Specifications in this document are tentative and subject to change.

R01DS0010EJ0010 Rev.0.10

Page 30 of 45

Aug 25, 2010

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.

trth

External power Vcc rise gradient

—

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. tw(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 tw(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

fLOCO

× 256

fLOCO

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