R8CSLASH15 datasheet(40/277 Pages) RENESAS

40 / 277 page

R8C/14 Group, R8C/15 Group

6. Voltage Detection Circuit

Rev.2.10

Jan 19, 2006

Page 28 of 253

REJ09B0164-0210

Figure 6.4

VCA1 and VCA2 Registers

Voltage Detection Register 1

Symbol

Address

After Reset(2)

VCA1

0031h

00001000b

Bit Symbol

Bit Name

Function

NOTES :

2. 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 Bit

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” (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 Bit

Set to “0”

Voltage Detection Register 2

(1)

After Reset(4)

Symbol

Address

Hardw are Reset : 00h

VCA2

0032h

Pow er-On Reset, Voltage Monitor 1Reset

: 01000000b

Bit Symbol

Bit Name

Function

NOTES :

b7 b6 b5 b4 b3 b2 b1 b0

00 0000

—

(b5-b0)

Reserved Bit

Set to “0”

VCA26

Voltage Detection 1 Enable Bit(2)

0 : Voltage detection 1 circuit disabled

1 : Voltage detection 1 circuit enabled

VCA27

Voltage Detection 2 Enable Bit(3)

0 : Voltage detection 2 circuit disabled

1 : Voltage detection 2 circuit enabled

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

When using the voltage monitor 1 reset, set the VCA26 bit to “1”.

After the VCA26 bit is set from “0” to “1”, the voltage detection circuit elapses for td(E-A) before starting operation.

When using 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 from “0” to “1”, the voltage detection circuit elapses for td(E-A) before starting operation.

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

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