R8CSLASH2G datasheet(71/344 Pages) RENESAS

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R8C/2G Group

7. Comparator

Rev.1.00

Apr 04, 2008

Page 51 of 318

REJ09B0387-0100

Figure 7.5

VW2C Register

Voltage Monitor 2 Circuit Control Register (1)

Symbol

Address

After Reset(2)

VW2C

0037h

00000010b

Bit Symbol

Bit Name

Function

NOTES:

b3 b2

[Source for setting this bit to 0]

0: Write 0

[Source for setting this bit to 0]

1: When interrupt request is generated

b1 b0

b7 b6 b5 b4

VW2C0

Comparator 2 interrupt enable bit(3) 0: Disable

1: Enable

0: Digital filter enabled mode

(digital filter circuit enabled)

1: Digital filter disabled mode

(digital filter circuit disabled)

VW2C2

Comparator 2 interrupt

flag(2, 5, 6)

VW2C1

Comparator 2 digital filter disable

mode select bit(4)

VW2C3

WDT detection flag(2, 6)

VW2F1

Sampling clock select bits

b5 b4

0 0: fOCO-S divided by 1

0 1: fOCO-S divided by 2

1 0: fOCO-S divided by 4

1 1: fOCO-S divided by 8

VW2F0

0: Not detected

1: Detected

VW2C6

Reserved bit

Set to 0.

VW2C7

Comparator 2 interrupt generation

condition select bit(7)

0: When VCMP2 reaches reference

voltage or above

1: When VCMP2 reaches reference

voltage or below

The VW2C2 is enabled w hen the VCA27 bit in the VCA2 register is set to 1 (comparator 2 circuit enabled).

Set this bit to 0 by a program. When 0 is w ritten by a program, it is set to 0 (and remains unchanged even if 1 is

w ritten to it).

The VW2C7 bit is enabled w hen the VCAC2 bit in the VCAC register is set to 0 (one edge). Set the VW2C7 bit after

setting the VCAC2 bit to 0.

Set the PRC3 bit in the PRCR register to 1 (w rite enabled) before rew riting the VW2C register.

When the VW2C register is rew ritten, the VW2C2 bit may be set to 1. Set the VW2C2 bit to 0 after rew riting the

VW2C register.

Bits VW2C2 and VW2C3 remain unchanged after a softw are reset or w atchdog timer reset.

The VW2C0 bit is enabled w hen the VCA27 bit in the VCA2 register is set to 1 (comparator 2 circuit enabled). Set

the VW2C0 bit to 0 (disable) w hen the VCA27 bit is set to 0 (comparator 2 circuit disabled).

To set the VW2C0 bit to 1 (enable), follow the procedure show n in Table 7.4 Procedure for Setting Bits

Associated w ith Com parator 2 Interrupt.

To use the comparator 2 interrupt to exit stop mode and to return again, w rite 1 to the VW2C1 bit after w riting 0.

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