R8CSLASH13 datasheet(167/224 Pages) RENESAS

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R8C/13 Group

16. Electrical Characteristics

Rev.1.20

Jan 27, 2006

page 156 of 205

REJ09B0111-0120

Table 16.7 Reset Circuit Electrical Characteristics (When Using Hardware Reset 2(1, 3))

Symbol

Standard

Typ.

Unit

Measuring condition

Min.Max.

Parameter

Vpor2

Power-on reset valid voltage

Vdet

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.

2. This condition is not applicable when using VCC

≥ 1.0V.

3. When turning power on after the external power has been held below the valid voltage (Vpor1) for greater than 10 seconds, refer to Table 16.8

Reset Circuit Electrical Characteristics (When Not Using Hardware Reset 2).

4. tw(por2) is time to hold the external power below effective voltage (Vpor2).

Supply voltage rising time when power-on reset is canceled(2)

tW(Vpor2-

Vdet)

100

–20°C

≤ Topr < 85°C

–20°C

≤ Topr < 85°C, tW(por2) ≥ 0s(4)

Figure 16.3 Reset Circuit Electrical Characteristics

Table 16.8 Reset Circuit Electrical Characteristics (When Not Using Hardware Reset 2)

Vpor1

Vcc min

Vdet(3)

tw(por1) tw(Vpor1–Vdet)

Sampling time(1,2)

Internal reset signal

(“L” effective)

fRING-S

X 32

fRING-S

X 32

Vpor2

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” for details.

3. Vdet shows the voltage detection level of the voltage detection circuit. Refer to “5.4 Voltage Detection Circuit” for details.

tw(por2) tw(Vpor2 –Vdet)

Table 16.6 Voltage Detection Circuit Electrical Characteristics

Symbol

Standard

Typ.

Unit

Measuring condition

Min.

Max.

Parameter

Vdet

Voltage detection level

3.8

4.3

NOTES:

1. The measuring condition is Vcc=AVcc=2.7V to 5.5V and Topr=-40°C to 85°C.

2. This shows the time until the voltage detection interrupt request is generated since the voltage passes Vdet.

3. This shows the required time until the voltage detection circuit operates when setting to "1" again after setting the VC27 bit in the VCR2

Voltage detection interrupt request generating time(2)

Voltage detection circuit self consumption current

Waiting time until voltage detection circuit operation starts(3)

td(E-A)

VC27=1, VCC=5.0V

3.3

600

µs

Vccmin

Microcomputer operation voltage minimum value

2.7

Symbol

Standard

Typ.

Unit

Measuring condition

Min.

Max.

Parameter

0.1

NOTES:

1. When not using hardware reset 2, use with Vcc

≥ 2.7V.

2. tw(por1) is time to hold the external power below effective voltage (Vpor1).

100

tW(Vpor1-

Vdet)

Supply voltage rising time when power-on reset is canceled

0.5

tW(Vpor1-

Vdet)

Supply voltage rising time when power-on reset is canceled

tW(Vpor1-

Vdet)

Supply voltage rising time when power-on reset is canceled

Vpor1

Power-on reset valid voltage

tW(Vpor1-

Vdet)

Supply voltage rising time when power-on reset is canceled

100

0°C

≤ Topr ≤ 85°C, tW(por1) ≥ 10s(2)

–20°C

≤ Topr < 0°C, tW(por1) ≥ 10s(2)

0°C

≤ Topr ≤ 85°C, tW(por1) ≥ 1s(2)

–20°C

≤ Topr < 85°C

–20°C

≤ Topr < 0°C, tW(por1) ≥ 30s(2)

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