Renesas RA0E3
Jump to navigation
Jump to search
The Renesas RA0E3 are energy-efficient ARM Cortex-M23 based microcontrollers, well suited for cost-sensitive and low-power applications.
Flash Banks
| Flash bank | Base address | J-Link support | Flasher support | Loader | |
|---|---|---|---|---|---|
| Name | Bank size | ||||
| Internal program flash | 0x00000000 |  |
|
Default | 16 KB |
| Option-setting memory | 0x01010010 | |
|
Default | 36B |
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
- Flash Read Protection (FRP) Support:
- FRP is disabled by modifying the OFS1 register, which resides in internal flash memory.
- FRP can only be disabled if the flash region is not protected by AWS.
- OFS1 is restored to its initial value upon disconnect.
Reset
- The device uses normal Cortex-M reset, no special handling necessary, like described here.
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.