Low power consumption, standard LCD microcontrollers suitable for LCD display of home appliances or measurement devices

 

RL78/L13 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: 1.61 μA (*2), and internal voltage boost: 1.42 μA, and capacitive split: 0.77 µA. With a lineup of 64/80-pin products supporting up to 376 segments, these microcontrollers are perfect for devices with built-in LCD panels such as home appliances and healthcare devices.

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

 

Key Features:

ITEM RL78/L13
Pin Count 64-pin 80-pin
Memory Program Flash 16 to 128 KB
Data Flash 4 KB
SRAM 1 to 8 KB
CPU RL78 CPU Core
Operating Frequency 24 MHz (max.)
Clock circuit         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 16 MHz:VDD = 2.4 to 5.5 V
  • 1 to 8 MHz:VDD = 1.8 to 5.5 V
    1 to 4 MHz:VDD = 1.6 to 5.5 V
High speed on-chip oscillator
  • 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)
subsystem clock XT1(crystal) oscillation, external subsystem clock input (EXCLKS) 32.768 kHz (VDD=1.6 to 5.5V)
Low speed on-chip oscillator Internal oscillation 15 KHz(TYP.) : VDD=1.6 to 5.5V
I / O 49 65
Timer TAU(16-bit timer) 8 ch (with 1 ch remote control output function) (timer outputs: 8, PWM output 7 ch)
KB20(16-bit timer) 1 ch (PWM outputs: 2)
Watchdog Timer 1 ch
12-bit timer Interval timer x 1 ch (15 kHz/32.768 kHz)
Real-time clock2 (RTC2) 1 ch
RTC output 1
8/10-bit A/D Convertor 9 ch 12 ch
Comparators 2 ch
Serial interface 
  • CSI: 1ch
  • UART(LIN-bus compatible): 1 ch
  • Simplified I2C: 1 ch
1
  • CSI: 1ch
  • UART: 1 ch
  • Simplified I2C: 1 ch
1
UART: 1 ch 1 2
I2C (Multi-master) 1
Vector interrupt 11 (external) / 32 (internal) 11 (external) / 35 (internal)
Key interrupt 5 8
LCD controller/driver Method Internal voltage boosting method, capacitor split method, and external resistance division method are switchable
Segment signal output 36(32) 51(47)
Common signal output 4(8)
Multiplier and divider / 16*16,32/32,16*16+32
multiply-accumulator circuit
DMA 4
Other peripheral functions LVD, POR, Key return, Clock output/buzzer function
Safety function
  • RAM parity error detection
  • Invalid memory access detection
  • Frequency detection
  • A/D converter testing
  • CRC operations
  • RAM guarding
  • SFR guarding
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 / TA = -40 to + 105 ℃ for G-Version product

Pin Count / Memory Size Lineup:

Program Flash
SRAM

128KB
8KB
             
96KB
6KB
             
64KB
4KB
             
48KB
2KB
             
32KB
1.5KB
16KB
1KB
8KB
1KB
             
Pins
Package
32
LQFP
44
LQFP
48
LFQFP
52
LQFP
64
LQFP
64
LFQFP
64
HWQFN
64
LQFP
64
LFQFP
80
LQFP
80
LFQFP
  • RL78/L12
  • RL78/L13

 

Block Diagram:

You can find an explanation of orderable part numbers here.

 

Resources for Software and Hardware

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e-learning Information for studying and learning about microcontrollers and microprocessors.
FAQ Frequently asked questions and useful hints for development.
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Software Design Support

Title Description
e² studio This integrated development environment (IDE) is based on the popular combination of the open-source Eclipse IDE and its CDT plug-in that enables C/C++ language development.
CS+ This integrated development environment (IDE) can be used for coding, assembly, compiling, and simulation. CS+ is also included with starter kits.
E2 emulator Lite This entry-level on-chip debugging emulator provides functionality equivalent to that of the E1 emulator at a low price.
E2 emulator This on-chip debugging emulator has advanced features that improve the efficiency of development. In addition to the basic functions from debugging to flash programming, this emulator supports hot plug-in and external triggers as standard items. This emulator also helps to reduce development time by downloading at high speeds (compared to the E1 emulator) and the ability to work in combination with various solutions such as the tuning of current drawn by systems under development.
E1 emulator This on-chip debugging emulator is a standard model which provides basic debugging functions (production is to be discontinued at the end of December 2019).

 

Hardware Design Support

Title Description
Characteristics data Information on observed values. Please use this as reference data when developing your set.
Oscillation circuit characteristics The resonators for which the operation is verified and their oscillator constants are shown below.
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