R8C2H datasheet(73/367 Pages) RENESAS

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R8C/2H Group, R8C/2J Group

7. Comparator

Rev.1.00

Mar 28, 2008

Page 53 of 341

REJ09B0388-0100

Comparator

The comparators compare a reference input voltage and an analog input voltage. Comparator 1 and comparator 2 are

independent of each other. Note that comparator 1 and comparator 2 share the voltage detection circuit with voltage

monitor 1 and voltage monitor 2. Either comparator 1 and comparator 2 or voltage monitor 1 and voltage monitor 2 can

be selected to use the voltage detection circuit.

7.1

Overview

The comparison result of the reference input voltage and analog input voltage can be read by software. The result

also can be output from the VCOUTi (i = 1 or 2) pin. An internal reference voltage or input voltage to the CVREF

pin can be selected as the reference input voltage. The comparator 1 interrupt and comparator 2 interrupt also can

be used.

Table 7.1 lists the Specifications of Comparator, Figure 7.1 shows the Block Diagram of Comparator, and Table 7.2

lists the Pin Configuration of Comparator.

Table 7.1

Specifications of Comparator

Item

Comparator 1

Comparator 2

Analog input voltage

Input voltage to VCMP1 pin

Input voltage to VCMP2 pin

Reference input voltage

Internal reference voltage or input voltage to CVREF pin

Comparison target

Whether passing thorough reference input voltage by rising or falling

Comparison result monitor

VW1C3 bit in VW1C register

VCA13 bit in VCA1 register

Whether higher or lower than reference input voltage

Interrupt

Comparator 1 interrupt (non-makable or

maskable selectable)

Comparator 2 interrupt (non-makable or

maskable selectable)

Interrupt request at both or either of

reference input voltage > input voltage to

VCMP1 pin and input voltage to VCMP1

pin > reference input voltage

Interrupt request at both or either of

reference input voltage > input voltage to

VCMP2 pin and input voltage to VCMP2

pin > reference input voltage

Digital

Filter

Switch

enabled/disabled

Available

Sampling time

(fOCO-S divided by n) × 2

n: 1, 2, 4, 8

Comparison result output Output from VCOUT1 pin (Whether the

comparison result output is inverted or not

can be selected)

Output from VCOUT2 pin (Whether the

comparison result output is inverted or not

can be selected)

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