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Renesas RA Family
5.2.3 MCU Boot Mode
A two-pin header (J15) is provided to select the Boot Mode of the MCU. For normal operation, or Single-
Chip Mode, leave J15 open. To enter SCI Boot Mode or USB Boot Mode, place a jumper on J15.
5.2.4 Debug Interface
The AIK-RA4E1 Debug Interface has two operating modes: (1) Onboard Debug using the Renesas RA4M2
microcontroller J-Link On-Board, 2) External Debug using the JTAG connector(J12).
The J-Link OB USB Micro-B connection jack (J10) connects the Renesas RA4M2 J-Link MCU to an external
USB Full Speed Host, allowing re-programming and debugging of the Main MCU firmware. This is the default
debug mode for AIK-RA4E1.
The Renesas RA4M2 J-Link MCU connects to the Main MCU using the SWD interface.
Table 2. Debug USB Connector (J10)
Debug USB Connector
Pin
Description
1
+5VDC
2
Data-
3
Data+
4
USB ID, jack internal switch, cable inserted
5
Ground
A yellow indicator LED4 provides a visual status of the state of the debug interface. When AIK-RA4E1 is
powered on, and LED4 is blinking, this indicates that the RA4M2 J-Link OB is not connected to a
programming host. When LED4 is on solid, this indicates that the RA4M2 J-Link OB is connected to a
programming interface.
5.2.4.1 External Debug
®
One 10-pin Cortex
Debug Connector is provided at J12, which supports JTAG and SWD. This connector
may be used for external debug of the Main MCU.
R12UZ0142EE0100 Rev.0.1
Oct.15.23
Figure 7. AIK-RA4E1 Debug Interface
UM-RA4E1, v1 User's Manual
AIK-RA4E1
Signal/Bus
+5V_JUSB
U3 USB_DM (U3-14)
U3 USB_DP (U3-15)
N.C.
GND
Page 11 of 22
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