R8C2H datasheet(79/367 Pages) RENESAS

79 / 367 page

R8C/2H Group, R8C/2J Group

7. Comparator

Rev.1.00

Mar 28, 2008

Page 59 of 341

REJ09B0388-0100

Figure 7.6

VCAB Register

Figure 7.7

ALCMR Register

Voltage Detection Circuit External Input Control Register(1)

Symbol

Address

After Reset

VCAB

003Bh

00h

Bit Symbol

Bit Name

Function

NOTE:

—

(b4-b0)

Reserved bits

Set to 0.

0: Supply voltage (VCC)

1: VCMP1 pin input voltage

b3 b2

VCAB5

b7 b6 b5 b4

VCMP1 comparison voltage external

input select bit

0: Internal reference voltage

1: CVREF pin input voltage

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

Comparator circuit reference voltage

select bit

VCAB6

VCMP2 comparison voltage external

input select bit

0: Supply voltage (VCC)

1: VCMP2 pin input voltage

VCAB7

Comparator Mode Register

Symbol

Address

After Reset

ALCMR

003Ch

00h

Bit Symbol

Bit Name

Function

b3 b2

LCM2POR

LCM1POR

b7 b6 b5 b4

VCOUT2 output polarity select

bit

VCOUT1 output polarity select

bit

0: Non-inverted comparator 1 comparison

result is output to VCOUT1

1: Inverted comparator 1 comparison

result is output to VCOUT1

0: Non-inverted comparator 2 comparison

result is output to VCOUT2

1: Inverted comparator 2 comparison

result is output to VCOUT2

0: Non-maskable interrupt

1: Maskable interrupt

Comparator 1 interrupt type

select bit

VCOUT2 output enable bit

0: Output disabled

1: Output enabled

Nothing is assigned. If necessary, set to 0.

When read, the content is 0.

—

(b7-b6)

—

IRQ1SEL

CM1OE

VCOUT1 output enable bit

0: Output disabled

1: Output enabled

CM2OE

IRQ2SEL

Comparator 2 interrupt type

select bit

0: Non-maskable interrupt

1: Maskable interrupt

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