M32CSLASH86 datasheet(68/505 Pages) RENESAS

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Page 45

6. Voltage Detection Circuit

)

(

Figure 6.4 D4INT Register

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

NOTES:

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

2. The D40 bit setting is enabled when the VC27 bit in the VCR2 register is set to "1" (low voltage

detection circuit enabled).

Use the following procedure to set the D40 bit to "1":

(1) Set the VC27 bit to "1"

(2) Wait td(E-A) ms to start operating the voltage detection circuit

(3) Wait required sampling time (see Table 6.2)

(4) Set the D40 bit to "1"

3. When exiting stop mode using the low voltage detection circuit again after having already done so,

set the D41 bit to "1" after setting it to "0".

4. The D42 bit setting is enabled when the VC27 bit in the VCR2 register is set to "1" (low voltage

detection circuit enabled). The D42 bit is set to "0" when the VC27 bit is set to "0" (low voltage

detection circuit disabled).

5. The bit is set to "0" by a program. (It remains unchanged even if it is set to "1".)

6. The D4INT register in M32C/86T cannot be used.

Symbol

Address

After Reset

D4INT

002F16

0016

Low Voltage Detection Interrupt Register(1,6)

b5 b4

0: Disables the interrupt

1: Enables the interrupt

0: Disabled (cannot use the low

voltage detection interrupt to exit

stop/wait mode)

1: Enabled (can use the low voltage

detection interrupt to exit stop/wait

mode)

0: Not detected

1: Detects above or below Vdet4

0: Not detected

1: Detected

D40

D41

D42

D43

WDT Overflow

Detect Flag(5)

Voltage Change

Detect Flag(4, 5)

Stop/Wait Mode

Deactivation

Control Bit(3)

DF0

DF1

(b7 - b6)

Bit Name

Function

Bit

Symbol

Sampling Clock

Select Bit

Low Voltage Detection

Interrupt Enable Bit(2)

Reserved Bit

When read,

its content is indeterminate

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