R8C13 datasheet(33/224 Pages) RENESAS

33 / 224 page

Rev.1.20

Jan 27, 2006

page 22 of 205

REJ09B0111-0120

R8C/13 Group

Figure 5.8 VCR1 Register and VCR2 Register

VC13

Voltage detection register 1

Symbol

Address

After reset(2)

VCR1

001916

000010002

Voltage monitor flag(1)

Bit name

Function

Bit symbol

b7b6b5b4b3b2b1b0

NOTES:

1. The VC13 bit is valid when the VC27 bit in the VCR2 register is set to “1” (voltage detection circuit enabled). The

VC13 bit is set to “1” (VCC

≥Vdet or voltage detection circuit disabled) when the VC27 bit in the VCR2 register is set

to “0” (voltage detection circuit disabled).

2. Software reset or the watchdog timer reset does not affect this register.

0:VCC < Vdet

1:VCC

≥ Vdet or voltage

detection circuit disabled

0000

000

Reserved bit

Should set to “0”

Voltage detection register 2

Symbol

Address

After reset(3)

VCR2

001A16

Reset input : 0016

RESET pin = “H” retaining : 100000002

Bit name

Bit symbol

NOTES:

1. Set the PRC3 bit in the PRCR register to “1” (write enabled) before writing to this register.

2. Set the VC27 bit to “1” (voltage detect circuit enabled) when hardware reset 2 is used.

After the VC27 bit is set to “1”, the voltage detection circuit elapses for td(E-A) before starting operation.

3. Software reset or the watchdog timer reset does not affect this register.

VC27

Voltage monitor enable

bit(2)

0: Voltage detection circuit

disabled

1: Voltage detection circuit

enabled

00000

Function

Reserved bit

Should set to “0”

(b2-b0)

(b7-b4)

(b6-b0)

(1)

5.4 Voltage Detection Circuit

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