R8C datasheet(83/106 Pages) RENESAS

83 / 106 page

R01DS0011EJ0100 Rev.1.00

Page 83 of 102

Dec 21, 2010

R8C/LA3A Group, R8C/LA5A Group, R8C/LA6A Group, R8C/LA8A Group

5. Electrical Characteristics

Notes:

The voltage detection level varies with detection targets. Select the level with the VCA24 bit in the VCA2 register.

Time until the voltage monitor 2 interrupt request is generated after the voltage passes Vdet2.

Necessary time until the voltage detection circuit operates after setting to 1 again after setting the VCA27 bit in the VCA2

Note:

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

Figure 5.14

Power-on Reset Circuit Characteristics

Table 5.40

Voltage Detection 2 Circuit Characteristics

(VCC = 1.8 to 5.5 V and Topr =

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

otherwise specified.)

Symbol

Parameter

Condition

Standard

Unit

Min.

Typ.

Max.

Vdet2

Voltage detection level Vdet2_0 (1)

At the falling of VCC

3.70

4.0

4.30

–

Hysteresis width at the rising of Vcc in

voltage detection 2 circuit

–0.10–

–

Voltage detection 2 circuit response time (2) In operation

At the falling of Vcc from

5 V to (Vdet2_0

− 0.1) V

–

150

µs

In stop mode

At the falling of Vcc from

5 V to (Vdet2_0

− 0.1) V

–

200

500

µs

–

Voltage detection circuit self power

consumption

VCA27 = 1, VCC = 5.0 V

–

1.7

–

µA

td(E-A)

Waiting time until voltage detection circuit

operation starts (3)

–

100

µs

Table 5.41

Power-on Reset Circuit Characteristics (1)

(Topr =

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

Symbol

Parameter

Condition

Standard

Unit

Min.

Typ.

Max.

trth

External power VCC rise gradient

–

50000

mV/msec

Notes:

1. Vdet0 indicates the voltage detection level of the voltage detection 0 circuit. Refer to 6. Voltage Detection

Circuit in the User’s Manual: Hardware for details.

2. tw(por) indicates the duration the external power VCC must be held below the valid voltage (0.5 V) to enable

a power-on reset. When turning on the power after it falls with voltage monitor 0 reset disabled, maintain

tw(por) for 1 ms or more.

Vdet0 (1)

0.5 V

Internal

reset signal

tw(por) (2)

Voltage detection 0

circuit response time

Vdet0 (1)

fOCO-S

× 32

fOCO-S

× 32

External

Power VCC

trth

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