R8C Key Features

1. High-speed On-chip Oscillator
   Matching unnecessary, no oscillation failure, plus greatly shortened oscillation stability time!
2. Power-on Reset (POR)
   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.
3. Low Voltage Detection (LVD)
   Save data during power cut-off!
4. Data Transfer Controller (DTC)
   Transfer data between memory and registers without going through CPU!
5. Data Flash with Background Operation (BGO)
   Continue operating CPU during data flash write/erase!
6. Power-Off Mode
   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

• 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

• 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 necessary data to data flash using Vdet1 or Vdet2 interrupt 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.

• 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

• 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.

• 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.