Here's a guy who believes he has some code working, and, apparently, believes also that he should use 'scanf' to scan the keypad. He seems to have no clue that there's a difference between registers and data memory, nor has he given any indication that he recognizes there's a difference between internal data memory and XDATA memory.

That's why the first 5E9 lines of code one writes for any MCU should be written in ASM and only then, when one no longer needs an assembler to produce the hex code, should one be permitted to use an HLL.

RE