RL78/G1A
General-purpose microcontrollers with built-in high-resolution A/D converter, suitable for measurement devices and sensor applications
RL78/G1A microcontrollers balance the industry's lowest level of consumption current (CPU: 66 μA/MHz, standby (STOP): 230 nA) and a high performance of 41 DMIPS (32 MHz). A built-in high-resolution 12-bit A/D converter, on-chip oscillator, data flash, and safety features (function that detects illegal operation of hardware) enable support for the household appliance safety standard (IEC/UL 60730). With an lineup of 25 to 64-pin LGA/BGA and other small packages, these microcontrollers are perfect for consumer and industrial sensor applications.
Main Solutions
Key Features:
ITEM | RL78/G1A | ||||
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Pin Count |
25-pin | 32-pin | 48-pin | 64-pin | |
Program Flash | 16 to 64 KB | 16 to 64 KB | 16 to 64 KB | 32 to 64 KB | |
Data Flash | 4 KB | ||||
SRAM | 2 to 4 KB | ||||
Power supply voltage | 1.6 to 3.6 V | ||||
Operating ambient temperature | Ta = −40 to +85 °C (A Version : For Consumer applications) Ta = −40 to +105 °C (G version : For Industrial applications) |
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Maximum operating Frequency | 32 MHz | ||||
External Oscillator | 1 to 20 MHz: VDD = 2.7 to 3.6 V, 1 to 8 MHz: VDD = 1.8 to 2.7 V, 1 to 4 MHz: VDD = 1.6 to 1.8 V X1 (crystal/ceramic) oscillation, external main system clock input (EXCLK) |
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Internal high speedOn-Chip Oscillator |
High speed main mode : 1 to 32 MHz (VDD = 2.7 to 3.6V), 1 to 16 MHz (VDD = 2.4 to 3.6V) Low speed main mode : 1 to 8 MHz (VDD = 1.8 to 3.6V) Low voltage main mode : 1 to 4 MHz (VDD = 1.6 to 3.6V) |
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Subsystem clock | - | XT1 (crystal) oscillation, external subsystem clock input (EXCLKS) 32.768 kHz (TYP.) | |||
Low speed On-Chip Oscillator | 15 KHz (TYP.) | ||||
Timer | 16-bit | 8 channels | |||
Watchdog Timer | 1 channel | ||||
Real-time Clock (RTC) | 1 channel | ||||
12-bit Interval timer | 1 channel | ||||
Timer output | 2 channels (PWM output : 1) |
4 channels (PWM output : 3) |
7 channels (PWM output : 4) |
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RTC output | - | 1 channel | |||
Serial Interface | CSI 1 ch/ UART 1ch/ simplified IIC 1 ch | 2 units | 2 units | 1 unit | - |
CSI 2 ch/ UART 1ch/ simplified IIC 2 ch | - | - | 1 unit | 2 units | |
CSI 2 ch/ UART 1 ch (supporting LIN-Bus)/ simplified IIC 2ch | - | - | 1 unit | 1 unit | |
CSI 1 ch/ UART 1 ch (supporting LIN-Bus)/ simplified IIC 1 ch | - | 1 unit | - | - | |
IIC Bus | 1 channel | ||||
12-bit A/D Converter | 13 channels | 18 channels | 24 channels | 28 channels | |
I/O Port | CMOS I/O | 14 (N-ch O.D. 6) | 20 (N-ch O.D. 9) | 32 (N-ch O.D. 11) | 46 (N-ch O.D. 12) |
CMOS input | 3 | 5 | |||
CMOS output | - | 1 | |||
N-ch open-drain I/O (6 V tolerance) | 2 | 3 | 4 | ||
Clock output/Buzzer output | 1 | 2 | 2 | ||
DMA controller | 2 channels | ||||
External vectored interrupt | 6 | 10 | 13 | ||
Key interrupt | 0 ch (4 ch) *Note | 1 ch (6 ch) *Note | 6 | 10 | |
On-chip debug function | Provided |
*Note : Channel count by using Peripheral I/O Redirection Register (PIOR)
Pin Count / Memory Size Lineup:
Block Diagram:

Below you will find information to support the development of your application.
You can find an explanation of orderable part numbers here.
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Hardware Design Support
Title | Description |
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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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