M32CSLASH8A datasheet(56/372 Pages) RENESAS

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M32C/8A Group

6. Power Supply Voltage Detection Function

Rev.1.00

Jul 15, 2007

Page 39 of 352

REJ09B0385-0100

Figure 6.3

D4INT Register

b7 b6 b5 b4

Vdet4 Detection Interrupt Register(1)

Symbol

D4INT

Address

002Fh

Bit Symbol

Bit Name

D40

After Reset

XX00 0000b

Function

Vdet4 detection interrupt

enable bit(2)

D41

0: Vdet4 detection interrupt is not used to exit

wait/stop mode

1: Vdet4 detection interrupt is used to exit

wait/stop mode

Wait mode/Stop mode exit

control bit(3)

0: Vdet4 detection interrupt disabled

1: Vdet4 detection interrupt enabled

D42

Voltage change detect flag(4, 5)

0: Not detected

1: Voltage crosses Vdet4

D43

WDT underflow detect flag(5)

0: Not detected

1: Detected

DF0

DF1

Unimplemented.

Read as undefined value.

Sampling clock select bits

b5 b4

0 0: CPU clock divided-by-8

0 1: CPU clock divided-by-16

1 0: CPU clock divided-by-32

1 1: CPU clock divided-by-64

−

(b7-b6)

NOTES:

1. Set the D4INT register after the PRC3 bit in the PRCR register is set to 1 (write enable).

2. Use the following procedure to set the D40 bit to 1:

(1) Set the VC27 bit in the VCR2 register to 1

(2) Wait for td(E-A) before the voltage detection circuit starts operating

(3) Wait for required sampling time (See Table "Sampling Period")

(4) Set the D40 bit to 1

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 to 1 to use the

Vdet4 detection interrupt again to exit these modes.

4. The D42 bit is enabled when the VC27 bit is set to 1 (Vdet4 detection function used ). The D42 bit becomes 0 when the VC27 bit

is set to 0 (Vdet4 detection function not used).

5. The D43 bit can be set to 0 by program. Writing a 0 has no effect.

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