need some rtc based on 8051 with alarms code

[engraxate]

need some rtc based on 8051 with alarms code or any help how to do that.
I have to do this using assembler. I can't use c or basic

 

[sick_man]

to make an rtc in an 8051

like any cpu you can use several technique

software rtc are tricky the mellenium bug proves this one
so you need too use timers and wasted timing cycles get added back on again too keep actual time

the timer events drive the actual count and any correction is added
before the time is called and the dat used or stored passed or updated

too do this you use timer based interupts
i found a page of source code onthe net with lots of projects

https://www.iguanalabs.com/library.htm


dont know if there is any use here

proteus vsm samples also has a clock design using an 8051 in asm

so perhaps you can mod this too suite