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 Pin 1: GND Pin 2: GND Pin 3: VDD Pin 4: RSTPU (Pull-up resistor for reset) Pin 5: TOOL0 (Bidirectional data line) Pin 6: RESET_IN Pin 8: VSS Pin 10: RESET_OUT Pin 12: GND Pin 13: RESET_OUT Pin 14: GND 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.
