R8C Family

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FAQ NO : 1000601 Issue Date : Sep.30.11 Functions : Other Timer/Pulse Function The TRCGRB register is used for the timer RC input capture function. Even if the CCLR bit in the TRCCR1 register is set to 1, the TRC counter is not cleared to 0000h by the input capture. When setting the CCLR bit to 1, the TRC counter can only be cleared to 0000h by the TRCGRA input capture or TRCGRA compare match. The TRC counter CANNOT be cleared using registers TRCGRB, TRCGRC, and TRCGRD. Relevant Products R8C/3x R8C/Lx
FAQ NO : 1000406 Issue Date : May.11.11 Functions : Debugging Function Why can’t debugging of a user program, in which the watchdog timer is used, be performed normally in a debugging system of the R8C UART monitor program? When using the R8C/10 to R8C/17 Groups, since the watchdog timer is not refreshed while the monitor program operates, a watchdog timer interrupt is generated and normal debugging cannot be performed. Do not use the watchdog timer in the user program w... Relevant Products R8C UART Monitor Program R8C/1x R8C/2x R8C/32C R8C/33C R8C/34C R8C/35C R8C/36C R8C/38C R8C/32D R8C/33D R8C/35D R8C/32M R8C/33M R8C/34M R8C/35M R8C/33T R8C/L35C R8C/L36C R8C/L38C R8C/L3AC R8C/M11A R8C/M12A
FAQ NO : 1000362 Issue Date : Apr.05.11 Functions : Flash Memory , Data Flash Sometimes the contents in the flash memory are rewritten. Does the user program contain any code to use the CPU rewrite mode, which is used to rewrite the flash memory? The flash memory may be rewritten if an unintentional operation in the user program, such as program runaway executes a CPU rewrite program.... Relevant Products R8C/1x R8C/2x R8C/3x R8C/Lx R8C/Mx
FAQ NO : 1000361 Issue Date : Apr.05.11 Functions : Oscillation Circuit Is there any problem that the oscillation amplitude is shown as approximately 1.5 V for the XIN-XOUT oscillation circuit? The oscillation amplitude level of the XIN-XOUT oscillation circuit in the R8C/3x, Lx, and Mx Series is designed to be smaller than that in the R8C/1x and 2x Series to reduce current consumption. There is no problem if the recommended oscillation circ... Relevant Products R8C/3x R8C/38A R8C/Lx R8C/Mx
FAQ NO : 1000360 Issue Date : Apr.05.11 Functions : I/O Register/SFR While a function is operating, can the corresponding standby bit be set to 1 (standby)? No. Set standby bits to 0 (active) during function operation. Stop the corresponding functions before setting these bits to 1 (standby). Relevant Products R8C/2x R8C/3x R8C/38A R8C/Lx R8C/Mx
FAQ NO : 1000359 Issue Date : Apr.05.11 Functions : Oscillation Circuit , General (Clock) Can the clock monitor bit (OCD3 bit or XINHALT bit) be used to confirm if the XIN clock oscillation is stabilized? No. The wait time until oscillation stabilizes should be generated in the program using the time shown in the matching evaluation provided by the oscillator manufacturer. Relevant Products R8C/1x R8C/2x R8C/3x R8C/38A R8C/Lx R8C/Mx
FAQ NO : 107458 Issue Date : Apr.05.11 Functions : A/D Converter When using the A/D converter, is there any change in the A/D conversion results based on the availability of the internal pull-up resistors selected in the analog input pin pull-up control register? The A/D conversion results vary based on the availability of the internal pull-up resistors selected in the analog input pin pull-up control register. When using the A/D converter, if changes in the A/D conversion results causes a problem, set to no i... Relevant Products R8C/1x R8C/2x R8C/3x R8C/38A R8C/Lx R8C/Mx
FAQ NO : 1000217 Issue Date : Oct.28.10 Functions : Flash Memory , Data Flash Can a program be run on data flash? Yes. When running a program on data flash, please refer to FAQ 106835. Relevant Products R8C/19 R8C/1B R8C/21 R8C/23 R8C/25 R8C/27 R8C/29 R8C/2B R8C/2D R8C/2F R8C/2L R8C/38A R8C/32C R8C/33C R8C/34C R8C/35C R8C/36C R8C/38C R8C/3GC R8C/3JC R8C/32M R8C/33M R8C/34M R8C/35M R8C/33T R8C/3JT R8C/33G R8C/34E R8C/34G R8C/36E R8C/36G R8C/38E R8C/38G R8C/34W R8C/34Y R8C/36W R8C/36Y R8C/38W R8C/38Y R8C/L35C R8C/L36C R8C/L38C R8C/L3AC R8C/L35M R8C/L36M R8C/L38M R8C/L3AM R8C/M11A R8C/M12A R8C/M13B
FAQ NO : 1000202 Issue Date : Oct.13.10 Functions : D/A Converter I set the D/A output to be input to the op-amp. In order to stabilize power supply, I'm considering adding a 100kΩ resistor for pull-down. Would this be okay? Since the D/A converter has an internal output resistor, if a pull-down resister is added, resistance from both the internal and pull-down resistors will divide the output level. Accordingly, D/A conversion precision will be worse than if there were n... Relevant Products R8C/2A R8C/2B R8C/2C R8C/2D R8C/2E R8C/2F R8C/38A R8C/33C R8C/34C R8C/35C R8C/36C R8C/38C R8C/3GC R8C/3JC R8C/33M R8C/34M R8C/35M R8C/33G, R8C/33H R8C/L35C R8C/L36C R8C/L38C R8C/L3AC R8C/L35M R8C/L36M R8C/L38M R8C/L3AM
FAQ NO : 1000188 Issue Date : Oct.06.10 Functions : Serial Interface (Clock Sync./Clock Async.) , I/O Port When only reception is performed using the serial interface in clock asynchronous serial I/O mode, can the TxD pin be used as a port? Also, when only transmission is performed, can the RxD pin be used as a port? When only reception is performed, the TxDi pin can be used as an I/O port by setting the function select register. When only transmission is performed, the RxD pin can be used as a port. Relevant Products R8C/3x R8C/38A R8C/Lx

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