Overview
Description
RX110 Group microcontrollers have the simplest lineup of the RX100 Series. They have a small-capacity, low pin count lineup from 8 KB/8 KB to 128 KB/16 KB ROM/RAM, and 36 to 64 pins. A 12-bit A/D converter, timer, serial interface, and more are built into a small 4 × 4 mm package. The RX110 is suitable for sensor hub and other applications where small size and processing performance are demanded.
Comparison
Applications
Design & Development
Software & Tools
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.

Support
Support Communities
Support Communities
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Getting stuck waiting for main clock oscillator and wait counter overflow.
Hey guys, I am using a RX110 series R5F51105ADFL series microcontroller along with e2 studio version 4.0( I know it's old but, it's what I have to work with). After generating the mock up code using the code generator and running it on the hardware, it seems ...
Aug 27, 2020 -
Difference between the reset sources for RX100 family
Hi there, For RX100 family there are several reset sources like RES# pin, soft reset, LVD, IWDT etc. I would like to know what differs between those reset sources? eg: pin reset and soft reset results in same condition? Thanks.
Aug 1, 2016 -
RX111 - RTCa
Hi, I'm looking for a RX110 or RX111 - RTCa example. I'd like it run in binary mode. TX
Feb 23, 2022
FAQs
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I have rewriting the backup PSW register, but it wouldn't rewrite.
Check that you aren't in user mode. The BPSW cannot be rewritten in user mode. Rewrite in supervisor mode. For more information, please refer to the "Processor Mode" section in the "CPU" chapter of the hardware manual.
Jun 20, 2013 -
Is O can only be read from register when reading RTC time after reset?
If the clock is operating (RCR2.START bit = 1), wait 1/128 of a second after returning before reading the counter register. The counter register can be read correctly. Please see Points for Caution When Writing to and Reading from Registers in the Realtime Clock chapter of the user ...
May 28, 2013 -
RX Family: Why does data sometimes missing during transmission using the RSPI?
When performing transmission in master mode during SPI operation, set the values of the RSPI sequence length specification bits (SPSCR.SPSLN[2:0]) and the number of frames specification bits (SPDCR.SPFC[1:0]) according to the combinations shown in the table "Settable Combinations of SPSLN[2:0] Bits and ...
Jun 20, 2013