Overview
Description
The RX21A group is the product that 24-bit Delta-sigma ADC is built in for measuring instruments such as a smart meter. PGA (Programmable Gain Amp) is built in Delta-sigma ADC, which is possible to amplify analog signal at most 64 times. The RX21A group has peripheral functions with special features, such as RTC which enables Time capture on event-signal input through external pins and DEU (Data Encryption Unit) which enables to use Encryption/decryption functions of the AES standard.
Comparison
Applications
Design & Development
Software & Tools
Software & Tools
Software title
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Software type
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Company
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DSP Library for RX Family Software library that implements numeric operation function used in DSP with general purpose MCU
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DSP / FFT | Renesas |
FAT File System FAT file system, Original file system
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File System | Renesas |
FAT File System [M3S-TFAT-Tiny] for the RX Family FAT file system for RX Family
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File System | Renesas |
RI600PX Real-time OS for RX Family μITRON4.0/PX Specification real-time OS for RX Family [Required IDE : CS+] * RI600PX is not generally promoted to U.S. and European customers. Customers in U.S. and Europe who are interested in RI600PX are requested to contact our regional marketing departments for details.
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ITRON OS | Renesas |
RI600V4 Real-time OS for RX Family μITRON4.0 Specification real-time OS for RX Family [Required IDE : e2 studio, CS+] * RI600V4 is not generally promoted to U.S. and European customers. Customers in U.S. and Europe who are interested in RI600V4 are requested to contact our regional marketing departments for details.
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ITRON OS | Renesas |
Data Flash Driver Block type Device Drivers for data flash embedded microcontrollers
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On-chip Flash Memory | Renesas |
Sound Playback/Compression System [M3S-S2-Tiny] for RX Family Sound playback system for RX Family
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Sound / Voice | Renesas |
C/C++ Compiler Package for RX Family [CC-RX] C/C++ Compiler Package for RX Family [IDE: CS+, e² studio, High-performance Embedded Workshop]
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Compiler/Assembler | Renesas |
High-performance Embedded Workshop Renesas integrated development environment (IDE) (for SuperH, RX, R8C, M32R, M16C, H8SX, H8S, H8, and 740 families).
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IDE and Coding Tool | Renesas |
Flash Development Toolkit (Programming GUI) Flash memory programming software. [Support MCU/MPU and devices: SuperH RISC engine, RX, R8C, M16C, H8SX, H8S, H8, 740]
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Programmer (Unit/SW) | Renesas |
Simulator Debugger for RX Family [for High-performance Embedded Workshop] Simulator debugger for RX family [Support IDE : High-performance Embedded Workshop] (Note: This product is included in Compiler Package and is not available separately.)
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Simulator | Renesas |
I²C Serial EEPROM Driver Device Drivers for I²C Bus Serial EEPROM R1EX24xxx Series, R1EV24xxx Series and HN58X24xxx Series
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Serial Memory | Renesas |
SPI/QSPI Serial Flash Memory, QSPI Serial Phase Change Memory Driver Device Driver for SPI and QSPI Serial Flash Memory and QSPI Serial Phase Change Memory
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Serial Memory | Renesas |
SPI Serial EEPROM Driver Device Drivers for SPI Bus Serial EEPROM R1EX25xxx Series and HN58X25xxx Series
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Serial Memory | Renesas |
E2 emulator [RTE0T00020KCE00000R] On-chip debugging emulator. Also available as a flash memory programmer. [Support MCU/MPU: RA, RE, RH850, R-Car D1, RL78, RX, RISC-V MCU]
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Emulator | Renesas |
E20 emulator [R0E000200KCT00] On-chip debugging emulator. Also available as a flash memory programmer. For RX600 or RX700 Series MCU, trace functions and Real-time RAM monitor functions available. For MCUs other than RX600 or RX700, the available debugging function corresponds to that of E2 Emulator Lite. [Support MCU/MPU: RX, RL78, RH850, V850, 78K0R, 78K0, R8C]
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Emulator | Renesas |
E2 emulator Lite [RTE0T0002LKCE00000R] On-chip debugging emulator. Also available as a flash memory programmer. [Support MCU/MPU: RA, RE, RL78, RX, RISC-V MCU]
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Emulator | Renesas |
PG-FP6 Flash memory programmer [Programming software: Dedicated GUI-based software, the "FP6 Terminal"] [Support MCU/MPU and devices: RA, RE, RX, RL78, RH850, RISC-V MCU, Renesas Synergy, Power Management, Renesas USB Power Delivery Family, ICs for Motor Driver/Actuator Driver, SuperH RISC engine, V850, 78K, R8C]
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Programmer (Unit/SW) | Renesas |
Renesas Flash Programmer (Programming GUI) Flash memory programming software [Support MCU/MPU and devices: RA, RE, RX, RL78, RH850, RISC-V MCU Renesas Synergy, DA1453x, DA1459x, DA1469x, DA1470x, Power Management, Renesas USB Power Delivery Family, ICs for Motor Driver/Actuator Driver, V850, 78K0R, 78K0]
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Programmer (Unit/SW) | Renesas |
QE for Current Consumption: A Dedicated Tool for Current Measurement Development assistance tool helps to shorten the times taken in operations for the tuning of currents drawn. [Standard item in the "e² studio" and CS+ (CS+ for CC only) IDEs] [Support MCU/MPU: RX, RL78]
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Solution Toolkit | Renesas |
CS+ Renesas integrated development environment (IDE) [Support MCU/MPU: RH850, V850, RX, RL78, 78K0R, 78K0]
(Note: CS+ is not generally promoted to U.S. and European customers.)
(Note: To use Smart Configurator on CS+ for RL78/G23 and RX family MCUs, install the Smart Configurator for each MCU family separately downloading from ”Design & Support” > ”Development Tools” > ”Smart Configurator”)
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IDE and Coding Tool | Renesas |
e² studio - Information for the RX Family Eclipse-based Renesas integrated development environment (IDE).
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IDE and Coding Tool | Renesas |
Renesas IAR Embedded Workbench Device-Support-Packages Renesas IAR Embedded Workbench Device-Support-Packages include all device-specific files to be used with the Embedded Workbench IDE.
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IDE and Coding Tool | Renesas |
Reality AI Utilities Round-trip workflow for AI development and performance validation allowing to collect data, optimize models, and deploy directly to Renesas hardware
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Solution Toolkit | Renesas |
24 items
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Sample Code
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.

Product Options
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Support
Support Communities
Support Communities
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UART Boolloader for RX21A
Hello All I want to update my RX21A firmware through UART so anyone having any doc or any sample code. I am using WiFi module with RX21A through UART and through WI-FI I want to update RX21A firmware. Thanks
Sep 13, 2019 -
RX21A E2 Data Flash writing/reading program
Hi friends, this is the first time that I'm using this forum and I hope to find someone that can help me! I'm using one of the uC of the family RX21A and I'm having some problems when I try to write or read date in the ...
Aug 10, 2013 -
Issue of Float and Double Precision variable in R5F521A6BDFP in RX21A Series on E2Studio V5.4.0.023 using Tool Chain KPIT GNURX-ELF ToolChain v 14.03
Dear All, We are using R5F521A6BDFP in RX21A Series on E2Studio V5.4.0.023 using Tool Chain KPIT GNURX-ELF ToolChain v 14.03, Initially we have used codes with variable Double assuming it will be 8 Byte with Double Precision, But Some how after some time at certain ...
Mar 22, 2018
FAQs
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MCU Functionality Problems at Higher Frequencies
Please check the following items: 1) Make sure that both the operating frequency and operating voltage are set within the allowable range. 2) Depending on the MCU, you must change the access cycles of the operational power control state, code flash, RAM, etc. To change the access cycles, check the ...
Jun 8, 2017 -
RX Family: Can A/D conversion be performed on other analog input?
No. When temperature sensor output or internal reference voltage is selected, please select single-scan mode, remove all analog inputs from conversion target, and perform A/D conversion.
May 20, 2014 -
Factors that Cause Flash Programming Errors (PRGERR)
... RX62T group, RX62G group) • "Command Lock State" in the Flash Memory (Target products: RX630 group, RX63N group, RX631 group, RX63T group, RX634 group, RX210 group, RX21A group, RX220 group) • "Flash Status Register 0 (FSTATR0)" in the Flash Memory (Target products: RX110 group, RX111 group, RX113 group, RX130 group, RX230 group ...
Jun 8, 2017