32C datasheet(33/55 Pages) RENESAS

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R8C/32C Group

5. Electrical Characteristics

R01DS0009EJ0100 Rev 1.00

Page 33 of 52

Aug. 24, 2010

Notes:

The measurement condition is VCC = 1.8 V to 5.5 V and Topr =

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

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

Notes:

The measurement condition is Topr =

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

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

Figure 5.3

Power-on Reset Circuit Electrical Characteristics

Table 5.9

Voltage Detection 2 Circuit Electrical Characteristics

Symbol

Parameter

Condition

Standard

Unit

Min.

Typ.

Max.

Vdet2

Voltage detection level Vdet2_0

At the falling of VCC

3.70

4.00

4.30

−

Hysteresis width at the rising of Vcc in voltage detection

2 circuit

−

0.10

−

Voltage detection 2 circuit response time (2)

At the falling of Vcc from

5 V to (Vdet2_0

− 0.1) V

−

150

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 5.10

Power-on Reset Circuit (2)

Symbol

Parameter

Condition

Standard

Unit

Min.

Typ.

Max.

trth

External power VCC rise gradient

(1)

−

50,000

mV/msec

Notes:

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

Circuit of User’s Manual: Hardware (REJ09B0573) 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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