R8CSLASH2G datasheet(69/344 Pages) RENESAS

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R8C/2G Group

7. Comparator

Rev.1.00

Apr 04, 2008

Page 49 of 318

REJ09B0387-0100

Figure 7.3

Registers VCA1 and VCA2

Voltage Detection Register 1

Symbol

Address

After Reset(2)

VCA1

0031h

00001000b

Bit Symbol

Bit Name

Function

NOTES:

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

VCA13

Comparator 2 signal monitor flag(1)

—

(b2-b0)

0: VCMP2 < reference voltage

1: VCMP2 ≥ reference voltage or

comparator 2 circuit disabled

Reserved bits

0000

Set to 0.

b7 b6 b5 b4 b3 b2 b1

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

VCA13 bit is set to 1 (VCMP2 ≥ reference voltage) w hen the VCA27 bit in the VCA2 register is set to 0 (comparator

2 circuit disabled).

—

(b7-b4)

Reserved bits

Set to 0.

Voltage Detection Register 2(1)

Symbol

Address

After Reset(2)

VCA2

0032h

Bit Symbol

Bit Name

Function

NOTES:

The LVD0ON bit in the OFS register is

set to 1 and hardw are reset

: 00h

Pow er-on reset, voltage monitor 0 reset

or the LVD0ON bit in the OFS register is

set to 0, and hardw are reset

: 00100000b

VCA25

Voltage detection 0 enable

bit(4)

0: Voltage detection 0 circuit disabled

1: Voltage detection 0 circuit enabled

—

(b4-b1)

Reserved bits

Set to 0.

b7 b6 b5 b4 b3 b2 b1 b0

0000

Use the VCA20 bit only w hen the MCU enters w ait mode. To set the VCA20 bit, follow the procedure show n in

Figure 11.9 Handling Procedure of Internal Pow er Low Consum ption Using VCA20 Bit.

VCA26

Comparator 1 enable bit(5)

0: Comparator 1 circuit disabled

1: Comparator 1 circuit enabled

Comparator 2 enable bit(6)

0: Comparator 2 circuit disabled

1: Comparator 2 circuit enabled

Softw are reset and w atchdog timer reset do not affect this register.

When the VCA20 bit is set to 1 (low consumption enabled), do not set the CM10 bit in the CM1 register to 1 (stop

mode).

VCA20

Internal pow er low

consumption enable bit(3)

0: Low consumption disabled

1: Low consumption enabled(7)

Set the PRC3 bit in the PRCR register to 1 (w rite enabled) before rew riting the VCA2 register.

To use the comparator 1 interrupt or the VW1C3 bit in the VW1C register, set the VCA26 bit to 1.

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

To use the comparator 2 interrupt 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 comparator 2 circuit w aits for td(E-A) to elapse before starting operation.

To use the voltage monitor 0 reset, set the VCA25 bit to 1.

After the VCA25 bit is set to 1 from 0, the voltage detection circuit w aits for td(E-A) to elapse before starting

operation.

VCA27

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