R26 datasheet(54/487 Pages) RENESAS

54 / 487 page

R8C/26 Group, R8C/27 Group

6. Voltage Detection Circuit

Rev.2.10

Sep 26, 2008

Page 35 of 453

REJ09B0278-0210

Figure 6.1

Block Diagram of Voltage Detection Circuit (N, D version)

Table 6.2

Specifications of Voltage Detection Circuit (J, K Version)

Item

Voltage Detection 1

Voltage Detection 2

VCC Monitor

Voltage to monitor

Vdet1

Vdet2

Detection target

Whether passing through Vdet1

by rising or falling

Passing through Vdet2 by rising or falling

Monitor

None

VCA13 bit in VCA1 register

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 fOCO-S) × 4

n: 1, 2, 4, and 8

(Divide-by-n of fOCO-S) × 4

n: 1, 2, 4, and 8

≥ Vdet2

VCA27

VCC

VCA13 bit

VCA1 register

Voltage detection 2

signal

Voltage detection 1

signal

Internal

reference

voltage

VCA26

≥ Vdet1

VCA25

≥ Vdet0

Voltage detection 0

signal

VW1C3 bit

VW1C register

Noise

filter

Noise

filter

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