R8C/M12A

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R8C/Mx

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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 : 1000187 Issue Date : Oct.06.10 Functions : Reset When using a hardware reset, what should be done to the reset input to the RESET pin when turning the power off (when the supply voltage falls)? When the supply voltage falls while the MCU operates within the range of the recommended operating conditions for the supply voltage, apply the following to the RESET pin: Apply a low to the RESET pin until the supply voltage falls below the range of... Relevant Products R8C/3x R8C/38A R8C/Lx R8C/Mx
FAQ NO : 1000169 Issue Date : Sep.22.10 Functions : Watchdog Timer The watchdog timer is initialized by writing 00h and then FFh to the WDTR register. Won't the watchdog timer be initialized if an interrupt is generated between these two instructions? The watchdog timer will be initialized even if an interrupt is generated between the writing of 00h and FFh. However, please note that the watchdog timer continues counting until FFh is written. Consequently, if the interrupt handling time is long, th... Relevant Products R8C/3x R8C/38A R8C/Lx R8C/Mx M16C/63 M16C/64A M16C/64C M16C/65 M16C/65C M16C/6C M16C/5L, M16C/56 M16C/5LD, M16C/56D M16C/5M, M16C/57
FAQ NO : 1000170 Issue Date : Sep.22.10 Functions : General (Timer) For timer RC, RD, or RG, what happens if the timing of transfer from a buffer register to a general register overlaps with writing to the buffer register? The data prior to writing to the buffer register is transferred to the general register. Relevant Products R8C/2x R8C/3x R8C/38A R8C/Lx R8C/Mx

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MPU/MCU Peripherals (30)
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