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RL78/L12

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The following page content corresponds to the products marketed in Japan.
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Product Overview:

Low power consumption, compact LCD microcontrollers suitable for small appliances and healthcare devices

RL78/L12 microcontrollers have a built-in segment LCD driver. Three LCD driving voltage generation methods (external resistance division, capacitive split, and internal voltage boost) are supported, corresponding to a variety of segment LCD panels. They realize low current consumption (*1): external resistance division: 1.60 μA (*2), internal voltage boost: 1.19 μA, and capacitive split: 0.68 µA. With a lineup of 32 to 64-pin products supporting up to 280 segments, these microcontrollers are perfect for small devices with built-in LCD panels such as small appliances and healthcare devices.

Remarks)
*1) Current (typ.) at 1/3 bias, subclock operation, HALT mode, and RTC operation
*2) Registance value for external registance division = 1000 kΩ

Key Applications:

  • Sensors or measuring instruments for consumer and industry use (Thermostat, Data logger etc.)
  • Healthcare (Blood pressure monitor, Body composition analyzer, Electric pedometer etc.)
  • Home appliances (IH rice cooker, Microwave oven etc.)
  • Small appliances (LCD remote controller, Water heater etc.)

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

Product Lineup:


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