Renesas RA0E1

The Renesas RA0E1 are Cortex-M23 based microcontrollers.

Internal Flash

Flash bank	Base address	J-Link support	Flasher support	Loader
				Name	Bank size
Internal program flash	0x00000000			Default	Up to 64 KB
Option-setting memory	0x01010010			Default	36 B
Internal data flash	0x40100000			Default	1 KB

Watchdog Handling

• The device has an Independent Watchdog Timer (IWDT).
• The watchdog is fed during flash programming.

Device Specific Handling

Connect

• Authentication via IDCODE is supported
• Wake-up CPU from low-power mode is supported
• Connect under reset is supported

Reset

• The devices uses normal Cortex-M reset, no special handling necessary, like described here.

Disconnect

On disconnect, the J-Link restores device specific settings which are required to support low power mode debugging but may result in an increased power consumption if not disabled.

Limitations

Security

• The device has a debug locking feature based on the 128 bit IDCODE, programmed into option-setting memory.
• During connection, the user will be asked to specify the IDCODE code to unlock debugging access if it was previously programmed.
• Use the following IDCODE to send the ALeRASE command, which triggers erasure of the user flash (code and data) area and the configuration area: FFFFFFFFFFFFFFFFFF45534152654C41
• Important: Make sure the byte order of the ALeRASE command is correct, as above shown above. A common mistake is using the wrong byte order, which will cause the command to fail.

Flash write protection

• The device implements a program flash write protection feature based on the access window. A pair of addresses can be programmed into option-setting memory to determine a memory range, in which programming/erasing operations are permitted.
• To disable flash protection using JLink commander:

exec EnableEraseAllFlashBanks
erase 0x01010010 0x01010034

• To disable flash protection using JFlash application:

1) Select "Opt flash" bank only.
2) Click Target -> Manual Programming -> Erase Sectors

• If FSPR bit of AWS register is set to 0, program flash write protection is enabled permanently.

Evaluation Boards

• Renesas FPB-RA0E1

Example Application

N/A