RA4M1 datasheet(7/130 Pages) RENESAS

7 / 130 page

R01DS0355EJ0100 Rev.1.00

Page 7 of 130

Oct 8, 2019

RA4M1 Group

1. Overview

USB 2.0 Full-Speed Module (USBFS) The USB 2.0 Full-Speed Module (USBFS) can operate as a host controller or device controller.

The module supports full-speed and low-speed (only for the host controller) transfer as defined

in the Universal Serial Bus Specification 2.0. The module has an internal USB transceiver and

supports all of the transfer types defined in the Universal Serial Bus Specification 2.0. The USB

has buffer memory for data transfer, providing a maximum of 10 pipes. Pipes 1 to 9 can be

assigned any endpoint number based on the peripheral devices used for communication or

based on the user system. The MCU supports revision 1.2 of the Battery Charging

specification. Because the MCU can be powered at 5 V, the USB LDO regulator provides the

internal USB transceiver power supply at 3.3 V. See section 27, USB 2.0 Full-Speed Module

(USBFS) in User’s Manual.

Table 1.8

Analog

Feature

Functional description

14-bit A/D Converter (ADC14)

A 14-bit successive approximation A/D converter is provided. Up to 25 analog input channels

are selectable. Temperature sensor output and internal reference voltage are selectable for

conversion. The A/D conversion accuracy is selectable from 12-bit and 14-bit conversion

making it possible to optimize the tradeoff between speed and resolution in generating a digital

value. See section 35, 14-Bit A/D Converter (ADC14) in User’s Manual.

12-Bit D/A Converter (DAC12)

The 12-Bit D/A Converter (DAC12) converts data and includes an output amplifier. See section

36, 12-Bit D/A Converter (DAC12) in User’s Manual.

8-Bit D/A Converter (DAC8)

for ACMPLP

The 8-Bit D/A Converter (DAC8) converts data and does not include an output amplifier

(DAC8). The DAC8 is used only as the reference voltage for ACMPLP. See section 40, 8-Bit D/

A Converter (DAC8) in User’s Manual.

Temperature Sensor (TSN)

The on-chip Temperature Sensor (TSN) determines and monitors the die temperature for

reliable operation of the device. The sensor outputs a voltage directly proportional to the die

temperature, and the relationship between the die temperature and the output voltage is linear.

The output voltage is provided to the ADC14 for conversion and can be further used by the end

application. See section 37, Temperature Sensor (TSN) in User’s Manual.

Low-Power Analog Comparator

(ACMPLP)

The Low-Power Analog Comparator (ACMPLP) compares the reference input voltage and

analog input voltage. The comparison result can be read through software and also be output

externally. The reference voltage can be selected from an input to the CMPREFi(i = 0,1) pin,

an internal 8-bit D/A converter output, or the internal reference voltage (Vref) generated

internally in the MCU.

The ACMPLP response speed can be set before starting an operation. Setting the high-speed

mode decreases the response delay time, but increases current consumption. Setting the low-

speed mode increases the response delay time, but decreases current consumption. See

section 39, Low-Power Analog Comparator (ACMPLP) in User’s Manual.

Operational Amplifier (OPAMP)

The Operational Amplifier (OPAMP) amplifies small analog input voltages and outputs the

amplified voltages. A total of four differential operational amplifier units with two input pins and

one output pin are provided. See section 38, Operational Amplifier (OPAMP) in User’s Manual.

Table 1.9

Human machine interfaces

Feature

Functional description

Segment LCD Controller (SLCDC)

The Segment LCD Controller (SLCDC) provides the following functions:

 Waveform A or B selectable

 The LCD driver voltage generator can switch between an internal voltage boosting method,

a capacitor split method, and an external resistance division method

 Automatic output of segment and common signals based on automatic display data register

read

 The reference voltage generated when operating the voltage boost circuit can be selected in

16 steps (contrast adjustment)

 The LCD can be made to blink.

See section 45, Segment LCD Controller (SLCDC) in User’s Manual.

Capacitive Touch Sensing Unit

(CTSU)

The Capacitive Touch Sensing Unit (CTSU) measures the electrostatic capacitance of the

touch sensor. Changes in the electrostatic capacitance are determined by software, which

enables the CTSU to detect whether a finger is in contact with the touch sensor. The electrode

surface of the touch sensor is usually enclosed within an electrical insulator so that fingers do

not come into direct contact with the electrode. See section 41, Capacitive Touch Sensing Unit

(CTSU) in User’s Manual.

Table 1.7

Communication interfaces (2 of 2)

Feature

Functional description

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