89c51rd2-cm

[Bem Djani]

Hello !
First: Sorry for my bad english but I hope will be enough to understand my problem.

I have two SkyCrypt modules for DVB IRD. This SkyCrypt is cloned Joker module. To change software in SkyCrypt CAM enough is programmed FUN smartcard with 64k eeprom and CAM start download. With this two something is wrong, not a possible to start download.

Inside is 89c51rd2-cm. Is it possible to put flash firmware for this CAM with ISP circuit and flash magic software, and also to make my program in C language for this MCU? Can I do this without extracting MCU from CAM (ISP)?

[Andy Ayre]

The only way to force the device into ISP mode is to ensure the hardware conditions are met. See the datasheet for the conditions. If you don't have access to the device pins, then I don't see how you will be able to do it.

The only other way is if the current firmware supports some kind of command or signal that places the device into ISP mode.