R8C23 datasheet(33/52 Pages) RENESAS

33 / 52 page

R8C/22 Group, R8C/23 Group

5. Electrical Characteristics

Rev.1.10 Mar 16, 2007

Page 33 of 48

REJ03B0097-0110

NOTES:

Topr = -40

°C to 85°C (D, J version) / -40°C to 125°C (K version), unless otherwise specified.

When the condition is Vcc

≥ 1.0, this parameter is not need.

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.

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 30s or more if -20

°C ≤ Topr ≤ 125°C, maintain

tw(por1) for 3,000s or more if -40

°C ≤ Topr < -20°C.

Figure 5.3

Power-on Reset Circuit Electrical Characteristics

Table 5.8

Power-on Reset Circuit, Voltage Monitor 1 Reset Circuit Electrical Characteristics(1)

Symbol

Parameter

Condition

Standard

Unit

Min.

Typ.

Max.

Vpor1

Power-on reset valid voltage(4)

−−

0.1

Vpor2

Power-on reset or vlotage monitor 1 valid voltage

−

Vdet1

trth

External power Vcc rise gradient(2)

−−

mV/msec

Vdet1(3)

Vpor1

tw(por1)

Vdet1(3)

Vpor2

× 32

fOCO-S

× 32

fOCO-S

2.7V

trth

External power Vcc

NOTES:

1. Hold the voltage of the MCU operation voltage range (2.7 V or above) within sampling time.

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

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

Internal reset signal

(“L” valid)

Sampling time(1, 2)

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