Renesas EK-RA4E2

Renesas RA Family EK-RA4E2 v1 – User's Manual
R20UT5175EG0300 Rev. 3.00 Page 15 of 30
Feb.27.23
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)
Target MCU
(the device that
is being
debugged)
Debugging
Interface/Protocol
Connector Used
Debug on-board
RA4M2 (on-board)
RA4E2 (on-board)
SWD
Micro USB (J10)
Debug in
External
debugging tools
RA4E2 (on-board)
SWD
20-pin connector (J20)
or 10-pin connector
(J13)
Debug out
RA4M2 (on-board)
Any external RA
MCU
SWD, JTAG
Micro USB (J10) plus
either 20-pin connector
(J20)
or 10-pin connector
(J13)
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
J8
J9
J29
Debug on-board
Closed
Jumper on pins 1-2
Open
Jumpers on pins 1-2, 3-4, 5-6, 7-8
Debug in
Closed
Jumper on pins 1-2
Closed
Jumpers on pins 1-2, 3-4, 5-6, 7-8
Debug out
Open
Jumper on pins 2-3
Open
All pins 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
EK-RA4E2
Pin
Description
Signal/Bus
J10-1
+5VDC
+5V_USB_DBG
J10-2
Data-
USB_DM (U7 pin 14)
J10-3
Data+
USB_DP (U7 pin 15)
J10-4
USB ID, jack internal switch, cable inserted
NC
J10-5
Ground
GND