jtagmkI.c and jtagmkII.c rely on OCDEN being bit 7 of hfuse

[stefanrueger]

jtagmkI.c and jtagmkII.c rely on OCDEN being bit 7 of hfuse

[mcuee]

I believe JTAG ICE (jtag1) does not support ATmega406, at least not officially. But I do not have the chip to carry out the test now.

I just checked the help file of Atmel Studio 4.19.730 (last version to support JTAG ICE).
https://www.microchip.com/en-us/tools-resources/archives/avr-sam-mcus
ATmega16(L), ATmega162(L), ATmega169(L or V), ATmega32(L), ATmega323(L), ATmega64(L), ATmega128(L).

@dl8dtl
Just wondering if you have ATmega406 to confirm. Thanks.

[mcuee]

BTW, JTAG ICE HW capability is there but the firmware is quite limited since Atmel dropped the support many years ago. I think there are quite some people who want to improve the FW to support more functionalities. However, I have not seen something concrete. The clones of JTAG ICE are really cheap (quality varies) and it is easy to DIY as well, unlike the clones for JTAG ICE mkII which are still quite expensive (that is why I have no interntions to get it).

• #1080
• #1054

Atmel also dropped the support of JTAGICE mkII later (not so sure when).

The latest Device supports only lists Atmel-ICE/Power Debugger and later. But the drop-down menu of latest MPLABX IDE for ATmega406 still shows JTAGICE3.
https://packs.download.microchip.com/DeviceDoc/Device_Support.pdf (for PIC/AVR/SAM, some tools are PIC only)

ICD5: ICD 5 In-Circuit Debugger
PICKit5: PICkit 5 In-Circuit Debugger
ICE4: ICE 4 In-Circuit Emulator, Programmer and Debugger
ICD4: ICD 4 In-Circuit Debugger
PICKit4: PICkit 4 In-Circuit Debugger
SNAP: SNAP In-Circuit Debugger
EDBG: Atmel Embedded Debugger
mEDBG: Mini Embedded Debugger
nEDBG: Nano Embedded Debugger
RealIce: MPLAB Real Ice In-Circuit Emulator
AT-ICE: ATMEL-ICE
AT-ICEPD: Power Debugger
Sim: Simulator
PICKit3: : PICkit 3 In-Circuit Debugger
ICD3D: ICD 3 In-Circuit Debugger
PM3: PM3 Universal Device Programmer