R8C26 datasheet(56/75 Pages) RENESAS

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R8C/26 Group, R8C/27 Group

5. Electrical Characteristics

Rev.2.10

Sep 26, 2008

Page 54 of 69

REJ03B0168-0210

NOTES:

1. The measurement condition is Topr = -40 to 85

°C (J version) / -40 to 125°C (K version), unless otherwise specified.

2. This condition (the minimum value of external power VCC rise gradient) does not apply if Vpor2

≥ 1.0 V.

3. To use the power-on reset function, enable voltage monitor 1 reset by setting the LVD1ON bit in the OFS register to 0, the

VW1C0 and VW1C6 bits in the VW1C register to 1 respectively, and the VCA26 bit in the VCA2 register to 1.

4. 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 ≤ 125°C, maintain tw(por1) for

3,000 s or more if -40

°C ≤ Topr < -20°C.

Figure 5.22

Reset Circuit Electrical Characteristics

Table 5.41

Power-on Reset Circuit, Voltage Monitor 1 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 1 reset valid

voltage

−

Vdet1

trth

External power VCC rise gradient

VCC

≤ 3.6 V

20(2)

−−

mV/msec

VCC

> 3.6 V

20(2)

−

2,000

mV/msec

Vdet1(3)

Vpor1

Internal reset

signal

(“L” valid)

tw(por1)

Vdet1(3)

Vpor2

× 32

fOCO-S

× 32

fOCO-S

2.0 V

trth

External

power VCC

NOTES:

1. When using the voltage monitor 1 digital filter, ensure VCC is 2.0 V or higher during the sampling time.

2. The sampling clock can be selected. Refer to 6. Voltage Detection Circuit of Hardware Manual for details.

3. Vdet1 indicates the voltage detection level of the voltage detection 1 circuit. Refer to 6. Voltage Detection

Circuit of Hardware Manual for details.

Sampling time(1, 2)

td(Vdet1-A)

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