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RL78/L12

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The following page content corresponds to the products marketed in Japan.
If you do not live in Japan, please

Product Overview:

RL78/L12 Group microcontrollers have a built-in liquid crystal display (LCD) panel driver that employs the RL78 core which realizes high processing performance while delivering the lowest power consumption in their class.
In addition to a high-precision (±1%) on-chip oscillator enabling 24 MHz CPU operation and other standard on-chip functions from the RL78/G13, the RL78/L12 microcontrollers are also equipped with a built-in ultralow consumption LCD circuit (0.63 uA by internal voltage boost) that reduces operating current when driving an LCD by 30% compared to previous products.
RL78/L12 microcontrollers support up to 280 LCD segments for panels with many pixels, and three methods of generating LCD drive voltage (internal voltage boost/capacitor split/external resistance division).
In addition, abundant functions for supporting functional safety, such as an A/D converter testing function, are also on-chip.
With 32 to 64-pin packages, these products are suitable for home appliances, remote control, kitchen tools, and other consumer electronics and healthcare devices, industrial equipment, and so on.

Pin Count / Memory Size Lineup:

map_rl78l12

Block Diagram:

Block Diagram image

Key Features:

32 pins
R5F10RBx
44 pins
R5F10RFx
48 pins
R5F10RGx
52 pins
R5F10RJx
64 pins
R5F10RLx
Memory Code flash 8 to 32 KB 16, 32 KB
Data flash 2 KB
RAM 1, 1.5 KB
Clock High speed system clock X1(crystal/ceramic) oscillation, external main system clock input (EXCLK)
1 to 20 MHz:VDD = 2.7 to 5.5 V,
1 to 8 MHz:VDD = 1.8 to 2.7 V, 1 to 4 MHz:VDD = 1.6 to 1.8 V
Low speed system clock HS(high-speed main) mode: 1 to 24 MHz(VDD = 2.7 to 5.5 V),
HS(high-speed main) mode: 1 to 16 MHz(VDD = 2.4 to 5.5 V) ,
LS(low-speed main) mode: 1 to 8 MHz (VDD = 1.8 to 5.5 V) ,
LV(low-voltage main) mode: 1 to 4 MHz (VDD = 1.6 to 5.5 V)
Sub system clock - XT1(crystal) oscillation, external system clock input(EXCLKS) 32.768 kHz(TYP.):VDD = 1.6 to 5.5 V
Low speed on-chip oscillator Internal oscillation
15 kHz(TYP.):VDD = 1.6 to 5.5 V
I/O port Total 20 29 33 37 47
CMOS I/O 15 22 26 30 39
CMOS input 3 5
CMOS output - 1
N-ch open Drain I/O (EVDD) 2
Pins only for LCD drive 8 11
LCD driver/controller Internal voltage boosting method, capacitor split method, and external
resistance division method are switchable.
Segment signals 13 22(18) 26(22) 30(26) 39(35)
Common signals 4 4(8)
Timer 16-bit timer 8 channels 8 channels (Remote control output 1 channel)
Watchdog timer 1 channel
Real Time Clock (RTC) 1 channel
12-bit interval timer (IT) 1 channel
Timer output 4 (PWM:3) 5 (PWM:4) 6 (PWM:5) 8 (PWM:7)
RTC output - 1 channel : 1 Hz (Sub system clock: fSUB = 32.768 kHz)
8/10-bit A/D converter 4 channels 7 channels 9 channels 10 channels
Serial interfaces CSI 2ch/UART(LIN-Bus support) 1 channel
I2C-bus 1 channel
DMA controller 2 channels
Vector interrupt source Internal 23
External 4 6 7 7 9
Key interrupt 4
Other peripherals Low voltage detection, Power-On Reset, Clock output/Buzzer function
On-chip debug function Available
Power supply voltage VDD = 1.6 to 5.5 V
Operating ambient temperature TA = -40 to + 85 ℃ for A-Version product / -40 to + 105 ℃ for G-Version product

Key Applications:

  • APS camera, digital camera, home audio system, air conditioner, washing machine, induction-heating (IH) cooker, electric rice cooker, power meter, pedometer, scale, etc.

Product Lineup:


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