Power Supply Considerations; Power-Up Behavior; Debug And Trace; Debug On-Board - Renesas RA4 Series User Manual

Renesas RA Family

5.1.2 Power Supply Considerations

The on-board LDO regulator which supplies +3.3 V has a built-in current limit of 2.0 A. Make sure the total
current required by the RA MCU, any active on-board features, and any connected peripheral devices does
not exceed this limit.
Note: The total current available from a typical USB host is 500 mA maximum. Depending on the
configuration of the kit, multiple power sources may be required.

5.1.3 Power-up Behavior

When powered, the white LED near the center of the board (the "dash" in the EK-RA4E2 name) will light up.
For more details on initial power up behavior, see the EK-RA4E2 Quick Start Guide.

5.2 Debug and Trace

The EK-RA4E2 board supports the following three debug modes.

Table 3. Debug Modes

Debug Modes Debug MCU
(the device that
connects to the
IDE on your PC)

Debug on-board

RA4M2 (on-board)
Debug in External
debugging tools
Debug out RA4M2 (on-board)
Notes:
•
See Table 5 for the Debug USB connector pin definitions.
•
See Table 8 for the 20-pin JTAG connector pin definitions.
•
See Table 9 for the 10-pin JTAG connector pin definitions.
The following table summarizes the jumper setting for each of the debug modes.

Table 4. Jumper Connection Summary for Different Debug Modes

Debug Modes J6
Debug on-board Closed
Debug in Closed
Debug out Open
5.2.1 Debug On-Board
The on-board debug functionality is provided using Renesas RA4M2 Debug MCU and SEGGER J-Link
firmware. Debug USB micro-B connector (J10) connects the RA4M2 Debug MCU to an external USB Full
Speed Host, allowing re-programming and debugging of the target RA MCU firmware. This connection is the
default debug mode for the EK-RA4E2 board.
The RA4M2 debug MCU connects to the target RA MCU using the SWD interface.
Table 5. Debug USB Connector
Debug USB Connector
Pin Description
J10-1 +5VDC
J10-2 Data-
J10-3
Data+
J10-4 USB ID, jack internal switch, cable inserted
J10-5 Ground
R20UT5175EG0300 Rev. 3.00
Feb.27.23
Target MCU
(the device that
is being
debugged)
RA4E2 (on-board)
RA4E2 (on-board)
Any external RA
MCU
J8 J9
Jumper on pins 1-2 Open
Jumper on pins 1-2 Closed
Jumper on pins 2-3 Open
EK-RA4E2 v1 – User's Manual
Debugging
Interface/Protocol
SWD
SWD
SWD, JTAG
J29
Jumpers on pins 1-2, 3-4, 5-6, 7-8
Jumpers on pins 1-2, 3-4, 5-6, 7-8
All pins open
EK-RA4E2
Signal/Bus
+5V_USB_DBG
USB_DM (U7 pin 14)
USB_DP (U7 pin 15)
NC
GND
Connector Used
Micro USB (J10)
20-pin connector (J20)
or 10-pin connector
(J13)
Micro USB (J10) plus
either 20-pin connector
(J20)
or 10-pin connector
(J13)
®
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