M32CSLASH86 datasheet(67/505 Pages) RENESAS

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Page 44

6. Voltage Detection Circuit

)

(

NOTES:

1. The VC13 bit setting is enabled when the VC27 bit in the VCR2 register is set to "1" (low voltage

detection circuit enabled). The VC13 bit is set to "1" when the VC27 bit is set to "0" (low voltage

detection circuit disabled).

2. The VCR1 register in M32C/86T cannot be used.

Symbol

Address

After Reset

VCR1

001B16

0000 10002

Voltage Detection Register 1(2)

VC13

(b2 - b0)

(b7 - b4)

Low Voltage

Monitor Flag(1)

Set to "0"

Reserved Bit

Set to "0"

Reserved Bit

0 : VCC < Vdet4

1 : VCC

≥ Vdet4

Bit Name

Function

Bit

Symbol

000

00 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 brown-out detection reset (hardware reset 2), set the VC26 bit to "1".

3. Set the VC27 bit to "1" to set the VC13 bit in the VCR1 register and the D42 bit in the D4INT register,

or to set the D40 bit to "1" (low voltage detect interrupt enabled).

4. The reset level detection circuit and low voltage detection circuit start operating td(E-A) ms after the

VC26 or VC27 bit is set to "1".

5. The VCR2 register in M32C/86T cannot be used.

6. The VC26 bit setting is disabled when the microcomputer is in stop mode. Its setting is not reset even

if the voltage applied to the VCC pin drops below Vdet3.

Symbol

Address

After Reset

VCR2

001716

0016(2)

Voltage Detection Register 2(1, 5)

(b5 - b0)

VC26

Set to "0"

VC27

Low Voltage

Monitor Bit(3, 4)

Reset Level

Monitor Bit(2, 4, 6)

Reserved Bit

0 : Disables reset level detection circuit

1 : Enables reset level detection circuit

0 : Disables low voltage detection

circuit

1 : Enables low voltage detection

circuit

Bit Name

Function

Bit

Symbol

Figure 6.3 VCR1 and VCR2 Registers

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