M32CSLASH8A datasheet(60/372 Pages) RENESAS

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M32C/8A Group

6. Power Supply Voltage Detection Function

Rev.1.00

Jul 15, 2007

Page 43 of 352

REJ09B0385-0100

Figure 6.6

Vdet4 Detection Function Operation Example

Voltage applied to VCC1

Time

Sampling period

RESET

VC27 bit

VC13 bit

Output from digital filter

D42 bit

Vdet4 detection

interrupt request signal

from D42 bit

Vdet4 detection

interrupt request signal

when D41 bit is 1

NOTES:

1. Apply an "L" to the RESET pin when the voltage input to the VCC1 pin drops to 3.0 V or below. When the

voltage rises above 3.0 V, and the voltage of the internal VDC and the main clock oscillation stabilize, apply an

"H" to the RESET pin.

2. When the D42 bit is set to 1, the Vdet4 detection interrupt request signal is not generated even if the Vdet4

detection signal is output from the digital filter.

3. If the Vdet4 detection interrupt has been used to exit wait mode or stop mode, set the D41 bit to 0 and then set

it back to 1 to use the Vdet4 detection interrupt again to exit wait/stop mode.

Vdet4 (V)

3 (V)

(note 1)

“H”

“L”

“H”

“L”

“H”

“L”

D41 bit

“H”

“L”

(note 2)

(note 3)

VC27 bit: bit in the VCR2 register

VC13 bit: bit in the VCR1 register

VC41 bit, VC42 bit: bits in the D4INT register

Set to 0 by program

Sampling period

Output from digital filter

D42 bit

Vdet4 detection

interrupt request signal

from D42 bit

“H”

“L”

“H”

“L”

Wait mode or

stop mode

Wait mode or

stop mode

Set to 0 by program

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