R8C Family

MPU & MCU


Matching unnecessary, no oscillation failure, plus greatly shortened oscillation stability time! Power rise gradient (Min.) not prescribed! * R8C/Mx, R8C/3xC, R8C/3xD, R8C/3xM, R8C/3xT, R8C/3xK, R8C/3xU, R8C/3xQ, R8C/L3xC and R8C/L3xM only. Save data during power cut-off! Transfer data between memory and registers without going through CPU! Continue operating CPU during data flash write/erase! Built-in Power-Off Mode great for power-saving applications!
*Please see latest hardware manuals for details on functions and their applicable product groups.


Wide pin selection from 14 to 100 pins Rich package and memory selection Diverse products from high-function to standard


Pin assignments which maintain compatibility, and on-chip peripheral functions Built-in high-performance flash memory Robust support for safe design A variety of development tools is available, from starter kits suitable for training and evaluation to emulators equipped with a wealth of debugging functions

High-speed On-chip Oscillator



Industry top-class oscillation precision R8C/32M - 38M and R8C/L35M - L3AM (oscillation frequency 40MHz): Except some groups ±1.5% oscillation precision in -40℃ - 85℃/1.8V - 5.5V 60％ increase precision than conventional products! Matching unnecessary, no oscillation failure Greatly shortened oscillation stability time Shortening from Typ.500μs to Typ.100μs Five times faster than conventional products! Reduced EMI noise and improved immunity EMS noise

Power-on Reset (POR) & Low Voltage Detection (LVD)


Power-on Reset		Low Voltage Detection

After power-on, reset is not deasserted until Vdet0 is detected Power rise gradient (Min.) is not prescribed * This specification of the power-on reset function is supported by R8C/Mx, R8C/3xC, R8C/3xD, R8C/3xM, R8C/3xT, R8C/3xK, R8C/3xU, R8C/3xQ, R8C/L3xC and R8C/L3xM only.		Generates interrupts when drops in supply voltage (Vdet1 and Vdet2) are detected Triggers reset when Vdet0 is detected ↓ Can save data to data flash during power cut-off



Voltage detection in R8C/3x, R8C/L3xC and R8C/L3xM R8C/3x, R8C/L3xC and R8C/L3xM can set detection voltages Vdet0, Vdet1, and Vdet2 independently.

Data Transfer Controller (DTC)

Transfers data between memory and registers without going through CPU Activated by peripheral interrupts


Data transfer without using DTC	Data transfer using DTC

Send A/D conversion results to RAM

Data Flash with Background Operation (BGO)

Continue operating CPU during data flash write/erase
Lack of need to hold CPU state greatly shortens instruction execution time and increases interrupt response rate
No need to worry about data flash programming time, so feels like programming with external EEPROM

*Data flash is flash memory which can be used to store data.

Data Flash with Background Operation (BGO)

Power-Off Mode

Power-off mode^*1, a low-power mode that can achieve further power savings compared to the previous wait and stop modes, has been newly added.
- Added power-off mode 1^*1 for operating RTC (real-time clock) functions using a low-speed clock to reduce power consumption due to leak current.
- Added power-off mode 0^*1, in which the power supply is completely disconnected, and which enables exiting by external interrupt.
Power-off mode 1^*1 can be easily entered using register settings.

*1: This function is included in the R8C/Lx Series.

R8C/L3xA, R8C/L3xB, and R8C/L3xM have power-off modes 0 and 1.

R8C/L3xC has power-off mode 0 only.

Structure and benefits of power supply control circuit. This on-chip circuit achieves significant power savings compared to the previous wait and stop modes.

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