Rev.1.00

Sep 17, 2004

page 17 of 26

REJ09B0062-0100Z

R8C/11 Group

5. Electrical Characteristics

Symbol

Standard

Typ.

Unit

Measuring condition

Min.

Max.

Parameter

Power-on reset valid voltage

NOTES:

1. The voltage detection circuit which is embedded in a microcomputer is a factor to generate the hardware reset 2. Refer to 5.1.2 Hardware

Reset 2 of Hardware Manual.

2. This condition is not applicable when using with Vcc

≥ 1.0V.

3. When turning power on after the time to hold the external power below effective voltage exceeds 10s, refer to Table 16.8 Reset Circuit

Electrical Characteristics (When Not Using Voltage Moitor 1 Reset).

s

Supply voltage rising time when power-on reset is canceled

2

V

ms

Vpor2

Vdet)

Vdet

0

Time to hold external power below valid voltage

100

Figure 5.3 Reset Circuit Electrical Characteristics

Sampling time1,2

Internal reset signal

(“L” effective)

1

X 32

1

X 32

NOTES:

1. Hold the voltage of the microcomputer operation voltage range (Vccmin or above) within sampling time.

2. A sampling clock is selectable. Refer to “5.4 Voltage Detection Circuit” of Hardware Manual for details.

of Hardware Manual for details.

Symbol

Standard

Typ.

Unit

Measuring condition

Min.

Max.

Parameter

Power-on reset valid voltage

NOTES:

1. When not the sing hardware reset 2, use with Vcc

≥ 2.7V.

Time to hold external power on below valid voltage

s

Supply voltage rising time when power-on reset is canceled

100

-20°C

≤ Topr ≤ 0°C

V

ms

Vpor1

Vdet)

Time to hold external power on below valid voltage

Time to hold external power on below valid voltage

0.1

0.5

1

Vdet)

Vdet)

Vdet)

Supply voltage rising time when power-on reset is canceled

Supply voltage rising time when power-on reset is canceled

Time to hold external power on below valid voltage

Supply voltage rising time when power-on reset is canceled

0°C

≤ Topr ≤ 85°C

0°C

≤ Topr ≤ 85°C

-20°C

≤ Topr ≤ 0°C

-20°C

≤ Topr ≤ 0°C

-20°C

≤ Topr ≤ 0°C

0°C

≤ Topr ≤ 85°C

0°C

≤ Topr ≤ 85°C

10

30

10

1

100

ms

ms

ms

s

s

s

Table 5.6 Reset Circuit Electrical Characteristics (When Using Hardware Reset 2)

Table 5.7 Reset Circuit Electrical Characteristics (When Not Using Hardware Reset 2)