Suitable for applications such as detectors and sensors requiring low power and analog integration


The RL78/I1D microcontroller has enhanced analog functions such as operational amplifiers, 12-bit A/D converter and window comparators. The MCU also supports very low power operation (124 uA @ 1 MHz ) and a high speed 4µs wake up.


Key Features:

Pin Count 20pin 24-pin 30-pin 32-pin 48-pin
Part Name  R5F11768
Program Flash 8 KB to 16 KB 8 KB to 32 KB 16 KB to 32 KB
SRAM 0.7 KB to 2 KB 0.7 KB to 3 KB 2 KB to 3 KB
Data Flash 2 KB
Main System Clock High-speed
system clock
X1 (crystal/ceramic) oscillation, external main system clock input (EXCLK)
1 to 20 MHz: VDD = 2.7 to 3.6 V, 1 to 8 MHz: 1.8 to 2.7 V, 1 to 4 MHz: 1.6 to 1.8 V
on-chip oscillator clock 24 MHz
HS (High-speed main) mode: 1 to 24 MHz (VDD = 2.7 to 3.6 V),
HS (High-speed main) mode: 1 to 16 MHz (VDD = 2.4 to 3.6 V),
LS (Low-speed main) mode: 1 to 8 MHz (VDD = 1.8 to 3.6 V),
LV (Low-voltage main) mode: 1 to 4 MHz (VDD = 1.6 to 3.6 V),
Middle-speed on-chip oscillator clock 4 MHz LP (Low-power main) mode: 1 MHz (VDD = 1.8 to 3.6 V)
Subsystem clock oscillator  - XT1 (crystal) oscillation
32.768 kHz (TYP.): VDD = 1.6 to 3.6 V
Low-speed on-chip oscillator 15 kHz (TYP.): VDD = 1.6 to 3.6 V
I/O Port Total 14 18 24 26 42
CMOS I/O 11 15 19 21 33
CMOS input 3 3 5 5 5
N-ch open drain output  - -  -  -  4
Timer 16-bit timer 4 channels
Watchdog timer 1 channel
Real-time clock 1 channel
RTC output  - 1 channel
- 1 Hz (subsystem clock generator and RTC/other clock: fSX = 32.768 kHz)
8/16-bit interval timer 4 channels (8-bit) / 2 channels (16-bit)
Timer output 2 4 3 4 4
Clock output/buzzer output 1 1 1 1 2
[20-pin, 24-pin products]
• 2.44 kHz, 4.88 kHz, 9.76 kHz, 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz (Main system clock: fMAIN = 20 MHz operation)
[30-pin, 32-pin, 48-pin products]
• 2.44 kHz, 4.88 kHz, 9.76 kHz, 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz (Main system clock: fMAIN = 20 MHz operation)
• 256 Hz, 512 Hz, 1.024 kHz, 2.048 kHz, 4.096 kHz, 8.192 kHz, 16.384 kHz, 32.768 kHz (subsystem clock generator and RTC/other clock: fSXR = 32.768 kHz operation)
12-bit resolution A/D converter 6 channels 12 channels 17 channels
Comparators 2 channels (Window comparators)
Operational amplifier 2 channels 4 channels
Data Operation Circuit (DOC) Comparison, addition, and subtraction of 16-bit data
Serial interface [20-pin, 30-pin products] CSI: 1 channel/UART: 1 channel/simplified I2C: 1 channel
[24-pin, 32-pin, 48-pin products] CSI: 2 channels/UART: 1 channel/simplified I2C: 2 channels
Data Transfer Controller (DTC) 16 sources 20 sources 19 sources 20 sources 23 sources
Event Link Controller (ELC) Event input: 15
Event input: 17 Event input: 17
Event input: 17 Event input: 20
Event trigger Event trigger Event trigger Event trigger Event trigger
output: 5 output: 5 output: 7 output: 7 output: 7
Vectored interrupt Internal 22 22 24 24 24
External 3 5 5 5 8
Key interrupt   3   3 4
Power-on-reset circuit - Power-on-reset: 1.51 +/- 0.04V (TA = -40 to +85°C)
- Power-down-reset: 1.50 +/- 0.04 V (TA = -40 to +85°C)
Voltage detector Power-on 1.67 V to 3.13 V (12 stages)
Power-down 1.63 V to 3.06 V (12 stages)
On-chip debug function Available (Enable to tracing)
Power supply voltage VDD = 1.6 to 3.6 V
Operating ambient temperature TA = -40 to +105°C

Pin Count / Memory Size Lineup:

Program Flash



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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