M32CSLASH8A datasheet(55/372 Pages) RENESAS

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M32C/8A Group

6. Power Supply Voltage Detection Function

Rev.1.00

Jul 15, 2007

Page 38 of 352

REJ09B0385-0100

Figure 6.2

VCR1 Register, VCR2 Register

b6 b5 b4

Voltage Detection Register 1

Symbol

VCR1

Address

001Bh

Bit Symbol

Bit Name

−

(b2-b0)

After Reset

0000 1000b

Function

NOTE:

1. The VC13 bit is enabled when the VC27 bit in the VCR2 register is set to 1 (Vdet4 detection function used).

The VC13 bit becomes 1 when the VC27 bit is set to 0 (Vdet4 detection function not used).

VC13

Voltage change monitor flag(1)

0: VCC1 < Vdet4

1: VCC1

≥ Vdet4

−

(b7-b4)

Reserved bits

Set to 0

0 0

Reserved bits

Set to 0

b6 b5 b4

Voltage Detection Register 2(1)

Symbol

VCR2

Address

0017h

Bit Symbol

Bit Name

−

(b5-b0)

After Reset

00h

Function

VC26

Vdet3 detection function

select bit(2, 4, 5)

0: Vdet3 detection function not used

1: Vdet3 detection function used

VC27

Vdet4 detection function

select bit(3, 4)

0: Vdet4 detection function not used

1: Vdet4 detection function used

Reserved bits

Set to 0

NOTES:

1. Set the VCR2 register after the PRC3 bit in the PRCR register is set to 1 (write enable).

2. To use the hardware reset 2 (Vdet3 detection function), set the VC26 bit to 1.

3. To use the Vdet4 detection function, set the VC27 bit to 1 and the D40 bit in the D4INT register to 1 (Vdet4 detection interrupt

used). The VC13 bit in the VCR1 register and the D42 bit in the D4INT register are enabled when the VC27 bit is set to 1.

4. After the VC26 or VC27 bit is set to 1, the detection circuit waits for td(E-A) to elapse before starting operation.

5. The VC26 bit is disabled when the MCU is in stop mode. (The hardware reset 2 is not performed even if the voltage applied to

the VCC1 pin drops below Vdet3.)

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