R8CSLASH15 datasheet(37/277 Pages) RENESAS

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R8C/14 Group, R8C/15 Group

6. Voltage Detection Circuit

Rev.2.10

Jan 19, 2006

Page 25 of 253

REJ09B0164-0210

Voltage Detection Circuit

The voltage detection circuit is a circuit to monitor the input voltage to the VCC pin. This circuit monitors the

VCC input voltage by the program. And the voltage monitor 1 reset, voltage monitor 2 interrupt and voltage

monitor 2 reset can be used.

Table 6.1 lists the Specification of Voltage Detection Circuit and Figures 6.1 to 6.3 show the Block

Diagrams. Figures 6.4 to 6.6 show the Associated Registers.

Table 6.1

Specification of Voltage Detection Circuit

Item

Voltage Detection 1

Voltage Detection 2

VCC Monitor

Voltage to Monitor

Vdet1

Vdet2

Detection Target

Whether passing

through Vdet1 by rising

or falling

Whether passing

through Vdet2 by rising

or falling

Monitor

None

VCA13 bit in VCA1

Whether VCC is higher

or lower than Vdet2

Process When Voltage Is

Detected

Reset

Voltage Monitor 1 Reset

Voltage Monitor 2 Reset

Reset at Vdet1 > VCC;

Restart CPU operation at

VCC > Vdet1

Reset at Vdet2 > VCC

Restart CPU operation

after a specified time

Interrupt

None

Voltage Monitor 2

Interrupt

Interrupt request at

Vdet2 > VCC and VCC >

Vdet2 when digital filter

is enabled;

Interrupt request at

Vdet2 > VCC or VCC >

Vdet2 when digital filter

is disabled

Digital Filter

Switch

Enabled / Disabled

Available

Sampling Time

(Divide-by-n of fRING-S)

x 4

n : 1, 2, 4 and 8

(Divide-by-n of fRING-S)

x 4

n : 1, 2, 4 and 8

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