Up to 54 MHz operation and built-in remote control receiver and HDMI-CEC for linking to home appliances


The RX634 Group operates at single voltage supply of 3.3 V but also at 5 V and performs at up to 54 MHz CPU clock. The RX634 group memory lineup offers up to 2 MB code flash, 128 KB RAM and 32 KB Data flash embedded. RX634 is available in a 144-pin package. Compared to the RX630 group the RX634 added HDMI-CEC function and Remote Control Signal Receiver function which are typical required features for digital home appliances. At the same time RX634 has been feature optimized by removing CAN, USB and RTC function to suit the market needs even better. Therefore RX634 suits ideally as a multimedia devices group, due to feature set as well as high performance. In addition RX634 group incorporate multi function timer (MTU2) and high speed 12-bit A/D converter enable to hold 3 channels at the same timing, which are typically required for industrial motor control applications.


Key Features:

CPU CPU Maximum operating frequency: 54 MHz, 32-bit RXv1 CPU
FPU Single precision (32-bit) floating point (in conformance with the IEEE754 standard)
Memory Proguram Flash Max 2 MB
Data Flash 32 KB
Clock Main clock oscillator : 20 MHz
low-speed on-chip oscillator : 125 kHz
PLL frequency synthesizer
IWDT-dedicated on-chip oscillator Oscillation stop detection Measuring circuit for accuracy of clock frequency (clock-accuracy check)
Reset RES# pin reset, power-on reset, voltage monitoring reset, watchdog timer reset, independent watchdog timer reset, deep software standby reset, and software reset
Interrupt External 14
Internal 164
External bus expansion 16 MB (CS0 to CS3)
Data transfer function DMA 4 channels
DTC transfer modes: Normal transfer, repeat transfer, and block transfer
Ports I/O 114
Input only 9
Event link controller (ELC) 56 sources
Multi-function pin controller (MPC) Supported
Timers 16-bit timer pulse unit 6 channels x 1 unit
Multifunction timer pulse unit (16-bit x 6 channels) x 1 unit
Programmable pulse generator (4 bits × 4 groups) × 1 unit
8-bit timer 2 channels × 2 units
Compare match timer (16 bits × 2 channels) × 2 units
Watchdog timer 14-bit x 1 channel
Independent watchdog timer 14-bit x 1 channel
Communication functions Serial communications interfaces 13 channels
I2C bus interface 3 channels
Serial peripheral interface 2 channels
CEC transmission / reception circuit 1 channel
Remote control signal receiver 2 channels
Analog A/D Converter 12-bit resolution x (16 channels x 1 unit)
D/A Converter 10-bit resolution x 2 channels
Other features CRC calculator (CRC) CRC code generation for arbitrary amounts of data in 8-bit units
Data Operation Circuit (DOC) Comparison, addition, and subtraction of 16-bit data
On-chip debug Supported E1 emulator (JTAG and FINE interfaces) Supported E20 emulator (JTAG interface)
Power Supply Voltage 2.7 to 3.6 V 4.0 to 5.5 V
Operating ambient temperature -40 to +85°C (products with wide-temperature-range spec.)
Packages 144-pin LQFP (PLQP0144KA-A)

Pin Count / Memory Size Lineup:

Program Flash


Block Diagram:

RX634 Block Diagram

You can find an explanation of orderable part numbers here.

Resources for Software and Hardware

Title Description
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e-learning Information for studying and learning about microcontrollers and microprocessors.
FAQ Frequently asked questions and useful hints for development.
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Software Design Support

Title Description
e² studio This integrated development environment (IDE) is based on the popular combination of the open-source Eclipse IDE and its CDT plug-in that enables C/C++ language development.
CS+ This integrated development environment (IDE) can be used for coding, assembly, compiling, and simulation. CS+ is also included with starter kits.
E2 emulator Lite This entry-level on-chip debugging emulator provides functionality equivalent to that of the E1 emulator at a low price.
E2 emulator This on-chip debugging emulator has advanced features that improve the efficiency of development. In addition to the basic functions from debugging to flash programming, this emulator supports hot plug-in and external triggers as standard items. This emulator also helps to reduce development time by downloading at high speeds (compared to the E1 emulator) and the ability to work in combination with various solutions such as the tuning of current drawn by systems under development.
E20 emulator This on-chip debugging emulator has enhanced debugging facilities such as large-capacity tracing and real-time RAM monitoring when used in combination with RX600 and RX700 MCUs (this emulator provides debugging functionality equivalent to that of the E1 emulator for other MCUs).
E1 emulator This on-chip debugging emulator is a standard model which provides basic debugging functions (production is to be discontinued at the end of December 2019).


Hardware Design Support

Title Description
Resonator Information Please search for your resonator on its manufacturer's site linked below. If you require optimal oscillation circuit constants for your particular system, please ask the manufacturer of the oscillator.

For main clock resonators : 
KYOCERA: Click here for RX634 oscillation evaluation result.
Murata Manufacturing: For IC Manufacturer, select Renesas Electronics, and enter R5F5634 into the IC Part Number search box.
You can filter the sample codes and application notes that are displayed using the below filters.

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