R7FA2L1AB2DFN datasheet(5/110 Pages) RENESAS

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Table 1.9

Human machine interfaces

Feature

Functional description

Capacitive Sensing Unit 2 (CTSU)

The Capacitive Sensing Unit 2 (CTSU) measures the electrostatic capacitance of the sensor.

Changes in the electrostatic capacitance are determined by software that enables the CTSU to

detect whether a finger is in contact with the sensor. The electrode surface of the sensor is

usually enclosed with a dielectric film so that a finger does not come into direct contact with the

electrode.

Table 1.10

Data processing

Feature

Functional description

Cyclic Redundancy Check (CRC)

calculator

The Cyclic Redundancy Check (CRC) calculator generates CRC codes to detect errors in the

data. The bit order of CRC calculation results can be switched for LSB-first or MSB-first

communication. Additionally, various CRC-generation polynomials are available. The snoop

function allows monitoring of reads from and writes to specific addresses. This function is useful

in applications that require CRC code to be generated automatically in certain events, such as

monitoring writes to the serial transmit buffer and reads from the serial receive buffer.

Data Operation Circuit (DOC)

The Data Operation Circuit (DOC) compares, adds, and subtracts 16-bit data. When a selected

condition applies, 16-bit data is compared and an interrupt can be generated.

RA2L1 Datasheet

1. Overview

R01DS0385EJ0100 Rev.1.00

Aug 06, 2020

Page 5 of 110

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