R8C2K datasheet(425/471 Pages) RENESAS

425 / 471 page

R8C/2K Group, R8C/2L Group

22. Electrical Characteristics

Rev.1.10

Dec 21, 2007

Page 408 of 450

REJ09B0406-0110

NOTES:

The measurement condition is Topr =

−20 to 85°C (N version) / −40 to 85°C (D version), unless otherwise specified.

This condition (external power VCC rise gradient) does not apply if VCC

≥ 1.0 V.

To use the power-on reset function, enable voltage monitor 0 reset by setting the LVD0ON bit in the OFS register to 0, the

VW0C0 and VW0C6 bits in the VW0C register to 1 respectively, and the VCA25 bit in the VCA2 register to 1.

tw(por1) indicates the duration the external power VCC must be held below the effective voltage (Vpor1) to enable a power on

reset. When turning on the power for the first time, maintain tw(por1) for 30 s or more if

−20°C ≤ Topr ≤ 85°C, maintain tw(por1) for

3,000 s or more if

−40°C ≤ Topr < −20°C.

Figure 22.3

Reset Circuit Electrical Characteristics

Table 22.9

Power-on Reset Circuit, Voltage Monitor 0 Reset Electrical Characteristics(3)

Symbol

Parameter

Condition

Standard

Unit

Min.

Typ.

Max.

Vpor1

Power-on reset valid voltage(4)

−−

0.1

Vpor2

Power-on reset or voltage monitor 0 reset valid

voltage

−

Vdet0

trth

External power VCC rise gradient(2)

−−

mV/msec

NOTES:

1. When using the voltage monitor 0 digital filter, ensure that the voltage is within the MCU operation voltage

range (2.2 V or above) during the sampling time.

2. The sampling clock can be selected. Refer to

6. Voltage Detection Circuit for details.

3. Vdet0 indicates the voltage detection level of the voltage detection 0 circuit. Refer to

6. Voltage Detection

Circuit for details.

Vdet0(3)

Vpor1

Internal

reset signal

(“L” valid)

tw(por1)

Sampling time(1, 2)

Vdet0(3)

fOCO-S

× 32

fOCO-S

× 32

Vpor2

2.2V

External

Power VCC

trth

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