Convert Standard J-Link to Renesas E1 Connector
The SEGGER RL78 14-Pin Programming Adapter seamlessly converts the standard 20-pin 0.1" J-Link connector to the Renesas-defined 14-pin E1 connector, enabling efficient flash programming of RL78 microcontrollers. This essential adapter bridges the gap between SEGGER's Flasher programming tools and Renesas RL78 target hardware.Supported RL78 Microcontroller Cores
| Family | Supported Cores |
|---|---|
| RL78/D Series | RL78/D1A |
| RL78/F Series | RL78/F12, RL78/F13, RL78/F14, RL78/F15 |
| RL78/G Series | RL78/G10, RL78/G11, RL78/G12, RL78/G13, RL78/G14 |
| RL78/G1 Series | RL78/G1A, RL78/G1C, RL78/G1D, RL78/G1E, RL78/G1F, RL78/G1G, RL78/G1H |
| RL78/I Series | RL78/I1A, RL78/I1B, RL78/I1C, RL78/I1D, RL78/I1E |
| RL78/L Series | RL78/L12, RL78/L13, RL78/L1A, RL78/L1C |
Selectable Target Supply Voltage
The adapter provides flexible power options with jumper-selectable 3.3V or 5V supply voltage. When the supply option is jumpered, the target is powered via the VTREF connection, eliminating the need for external power during programming operations. Important: This adapter is exclusively for flash programming. It cannot be used with J-Link debug probes and does not support debugging functionality for RL78 devices.
Wiring Quick-Start
Essential Connections
14-pin E1 connector pinout diagram
TOOL0 Pull-up Configuration
RL78 devices use open-drain TOOL0 pins requiring external pull-up resistors. While evaluation boards typically include these resistors, the adapter features an additional solder bridge between VTREF and TOOL0 to accommodate targets without built-in pull-ups. Recommended pull-up resistance: 1kΩ to VTREF
Programming Interface Specifications
| Parameter | Specification |
|---|---|
| Input Connector | 20-pin 0.1" standard (J-Link compatible) |
| Output Connector | 14-pin E1 connector (Renesas standard) |
| Supply Voltage | 3.3V or 5V (jumper selectable) |
| Communication Protocol | Single-line UART via TOOL0 |
| Target Current | Up to 500mA |
For J-Link debug functionality, use SEGGER's standard J-Link adapters. This RL78 adapter is specifically designed for production flash programming with Flasher tools.