R5F211B2DSP datasheet(63/339 Pages) RENESAS

63 / 339 page

R8C/1A Group, R8C/1B Group

7. Voltage Detection Circuit

Rev.1.30

Dec 08, 2006

Page 47 of 315

REJ09B0252-0130

Figure 7.4

Registers VCA1 and VCA2

Voltage Detection Register 1

Symbol

Address

After Reset(2)

VCA1

0031h

00001000b

Bit Symbol

Bit Name

Function

NOTES :

The VCA13 bit is enabled w hen the VCA27 bit in the VCA2 register is set to 1 (voltage detection 2 circuit enabled).

The VCA13 bit is set to 1 (VCC

≥ Vdet 2) w hen the VCA27 bit in the VCA2 register is set to 0 (voltage detection 2

circuit disabled).

—

(b7-b4)

Reserved bits

Set to 0.

b7 b6 b5 b4 b3 b2 b1 b0

0000

The softw are reset, w atchdog timer reset, and voltage monitor 2 reset do not affect this register.

VCA13

Voltage detection 2 signal monitor

flag(1)

—

(b2-b0)

0 : VCC < Vdet2

1 : VCC

≥ Vdet2 or voltage detection 2

circuit disabled

Reserved bits

Voltage Detection Register 2

(1)

After Reset(4)

Symbol

Address

Hardw are reset : 00h

VCA2

0032h

Pow er-on reset, voltage monitor 1 reset :

01000000b

Bit Symbol

Bit Name

Function

NOTES :

Set the PRC3 bit in the PRCR register to 1 (w rite enable) before w riting to this register.

To use the voltage monitor 1 reset, set the VCA26 bit to 1.

After the VCA26 bit is set to 1 from 0, the voltage detection circuit w aits for td(E-A) to elapse before starting

operation.

To use the voltage monitor 2 interrupt/reset or the VCA13 bit in the VCA1 register, set the VCA27 bit to 1.

After the VCA27 bit is set to 1 from 0, the voltage detection circuit w aits for td(E-A) to elapse before starting

operation.

Softw are reset, w atchdog timer reset, and voltage monitor 2 reset do not affect this register.

VCA27

Voltage detection 2 enable bit(3)

0 : Voltage detection 2 circuit disabled

1 : Voltage detection 2 circuit enabled

VCA26

Voltage detection 1 enable bit(2)

0 : Voltage detection 1 circuit disabled

1 : Voltage detection 1 circuit enabled

—

(b5-b0)

Reserved bits

Set to 0.

0000

b3 b2 b1 b0

b7 b6 b5 b4

R5F211B2DSP Datasheet(PDF) 63 Page - Renesas Technology Corp

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