R8C2K datasheet(58/471 Pages) RENESAS

58 / 471 page

R8C/2K Group, R8C/2L Group

6. Voltage Detection Circuit

Rev.1.10

Dec 21, 2007

Page 41 of 450

REJ09B0406-0110

6.3

Voltage Monitor 1 Interrupt and Voltage Monitor 1 Reset

Table 6.3 lists the Procedure for Setting Bits Associated with Voltage Monitor 1 Interrupt and Reset. Figure 6.10

shows an Example of Voltage Monitor 1 Interrupt and Voltage Monitor 1 Reset Operation. To use the voltage

monitor 1 interrupt or voltage monitor 1 reset to exit stop mode, set the VW1C1 bit in the VW1C register to 1

(digital filter disabled).

NOTES:

1. Set the VW1C7 bit to 1 (when VCC reaches Vdet1 or below) for the voltage monitor 1 reset.

2. When the VW1C0 bit is set to 0, steps 3, 4, and 5 can be executed simultaneously (with 1

instruction).

Table 6.3

Procedure for Setting Bits Associated with Voltage Monitor 1 Interrupt and Reset

Step

When Using Digital Filter

When Not Using Digital Filter

Voltage Monitor 1

Interrupt

Voltage Monitor 1

Reset

Voltage Monitor 1

Interrupt

Voltage Monitor 1

Reset

Set the VCA26 bit in the VCA2 register to 1 (voltage detection 1 circuit enabled)

Wait for td(E-A)

Select the sampling clock of the digital filter

by the VW1F0 to VW1F1 bits in the VW1C

Select the timing of the interrupt and reset

request by the VW1C7 bit in the VW1C

4(2)

Set the VW1C1 bit in the VW1C register to 0

(digital filter enabled)

Set the VW1C1 bit in the VW1C register to 1

(digital filter disabled)

5(2)

Set the VW1C6 bit in

the VW1C register to

0 (voltage monitor 1

interrupt mode)

Set the VW1C6 bit in

the VW1C register to

1 (voltage monitor 1

reset mode)

Set the VW1C6 bit in

the VW1C register to

0 (voltage monitor 1

interrupt mode)

Set the VW1C6 bit in

the VW1C register to

1 (voltage monitor 1

reset mode)

Set the VW1C2 bit in the VW1C register to 0 (passing of Vdet1 is not detected)

Set the CM14 bit in the CM1 register to 0

(low-speed on-chip oscillator on)

−

Wait for 4 cycles of the sampling clock of the

digital filter

− (No wait time required)

Set the VW1C0 bit in the VW1C register to 1 (voltage monitor 1 interrupt/reset enabled)

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