This should be the responsibility of the software programmer. For example, LJMP 7E0H would be a valid instruction for the AT89C2051 (with 2K of memory), whereas LJMP 900H would not. 7.1 Branching Instructions LCALL, LJMP, ACALL, AJMP, SJMP, JMP @A+DPTR – These unconditional branching.

Hi people, I have two pieces of AT89C2051 which I would like to put somewhere (timer or something) but I don't have programmer for that mcu. In further, I don't want to spent big money on bying or building programmer for it.

But looking for workaround. As far as I can see, software for Arduino (at the moment I have Arduino UNO R3) has 'Parallel programming' option, which is only option to program mcu like AT89C2051. Problem is that AT89C requires 12V for programming and Arduino does not has this.

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Has anyone tried to use Arduino for programming such mcu like AT89 and if it possible how to do that? How to pump-up that signal level and what else is needed.? Hi people, I have two pieces of AT89C2051 which I would like to put somewhere (timer or something) but I don't have programmer for that mcu. In further, I don't want to spent big money on bying or building programmer for it. But looking for workaround.

As far as I can see, software for Arduino (at the moment I have Arduino UNO R3) has 'Parallel programming' option, which is only option to program mcu like AT89C2051. Problem is that AT89C requires 12V for programming and Arduino does not has this.

Has anyone tried to use Arduino for programming such mcu like AT89 and if it possible how to do that? How to pump-up that signal level and what else is needed.? Knut Yes, it is possible.

AFAIk there is no such work done. It takes too much time and effort for a beginner. If you have enough time and try to learn some thing, you can try it out. Yes, it is possible. AFAIk there is no such work done. It takes too much time and effort for a beginner.

If you have enough time and try to learn some thing, you can try it out. Just one question - if I understand well this programmer from above link (@santoshaxl) and looking of datasheet of AT89C2051 - this mcu requires 12V only on RST pin, other pins work on HIGH/LOW level of maximum 5V!? The idea is just this - to mix above programmer and Arudiono board. I assume, I can remove above AT89C from programmer and use Arduino instead. After that problem is programming software. Am I correct?