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R8C/22

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16-bit Microcontrollers with R8C CPU Core (Non Promotion)

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Overview

The R8C/22 Group is supported only for customers who have already adopted these products. The RL78/F12, F13, F14, F15 Groups are recommended for new designs.

This MCU is built using the high-performance silicon gate CMOS process using the R8C CPU core and is packaged in a 48-pin plastic molded LQFP. This MCU operates using sophisticated instructions featuring a high level of instruction efficiency. With 1Mb of address space, it is capable of executing instructions at high speed. This Furthermore, the data flash (1KB x 2 blocks) is embedded in the R8C/21 Group. The difference between R8C/20 and R8C/21 Groups is only the existence of the data flash. Their peripheral functions are the same.

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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.

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Resources

Support Communities

  1. R8C/22 Clock Synchronous Serial I/O Mode

    I am using R8C/22 UART0 in Clock Synchronous Serial I/O Mode as a SPI slave.Below is the code snippet for the configuration and reception.PORT CONFIGURATIONu0mr = 0x09;   u0c0 = 0x80;                                 u0c1 = 0x05;                  //u0brg = 10-1;s0tic = 0x00;  s0ric = 0x00; I am trigerring the ISR ...

    Jun 16, 2009
  2. R8C/22: how to do SSU with flash-memory (M25P64)?

    Hello everybody,I want to use the SSU-interface of the R8C/22 to communicate with the serial flash memory M25P64 (PageProgramm, Read data, Bulk erase). On the renesas-HP is only an application note with the UART0-Interface. How easy is it to change this UART0 program to ...

    Nov 30, 2009
  3. R8C/22: Port p0_7 unable to pull down a pulled up data line???

    Dear friends,I have a problem with the R5F2122CKFP from Renesas. A data line which is pulled up (10k, 3.3V) is connected to Port p0_7. To send a signal I want to pull down this line by the  microcontroller, but it doesn't work. Is the p0_7 ...

    Dec 20, 2009
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FAQs

  1. (R8C) Are there any hardware precautions for accurate A/D conversion?

    In order to perform A/D conversion, it is necessary to fully charge the internal capacitor, but if the impedance of the A/D conversion target is high, the discharge and charge will take time and the conversion value will not be accurate. For correct A/D ...

    Jun 19, 2006
  2. Do I need to rewrite the boot ROM area using MI6C Flash Starter?

    Rewriting of the boot ROM area is unnecessary. This is because M3A-0806 performs programming using the standard boot program which was programmed into the boot ROM area when it was shipped. (#104963)

    Mar 1, 2005
  3. Please tell me how to set the option function register in detail.

    There are three methods for setting the option function select register using the C complier package M3T-NC30WA: Using the load module converter (lmc30 -R8C) -OFSREGX (or -PROTECTX) option Using assembler directive command .OFSREG (or .PROTECT) By assembly programming The load module converter option and directive command depend on the ...

    Mar 13, 2009
View All Results from FAQs (12)