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RL78/F13, F14 CHAPTER 14 COMPARATOR (RL78/F14 Only)

R01UH0368EJ0210 Rev.2.10 776

Dec 10, 2015

CHAPTER 14 COMPARATOR (RL78/F14 Only)

14.1 Overview

The comparator compares a reference voltage to an analog input voltage. The results of a comparison of reference

voltage and analog input voltage can be read by software. The comparison result is output externally and an interrupt or

ELC event is requested upon detection of a change between the two voltages.

The reference input voltage can be either the input from the IVREF0 pin or the output from the on-chip D/A converter.

There are four analog input pins, one of which is to be selected.

Table 14-1 lists the comparator specifications and figure 14-1 shows the Comparator Block Diagram.

Table 14-1. Comparator Specifications

Item Specification

Number of channels One (comparator 0)

Analog input voltage Input voltage from the IVCMP00 to IVCMP03 pins (one of them to be selected)

Reference voltage

 Internal reference voltage (output from on-chip D/A converter)

 Input voltage from the external reference voltage input pin (IVREF0)

Comparator output

 Comparison result

 Generation of ELC event output

 Monitor output from register

Interrupt request signal  An interrupt request is generated on detecting a valid edge of comparison result.

 Rising edge, falling edge, or both edges can be selected.

Digital filter function  One of three sampling frequencies can be selected.

 Not using the filter function can be selected.

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