reading a 16 byte array with the 8051

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Octavius12

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Hello, first time post there. Im just having a little trouble writing a sub routine to be used on my 8051

All I need to do is scan an array of 16 consecutive numbers from external memory starting at a location (lets say 2020h) and returns the high byte of the maximum unsigned value on R2 and the low byte on R3.

i started with

mov DPTR, #2020h
mov R0, #10h


but now I'm pretty stuck. Im new to this


Any help would be much appreciated
 

to take the date from external ram memory, u can use the following instruction,
movx a,@dptr
mov r2,a

above instructions fetches data from external memory and puts it into the r2 register. similarly u can do it for other data.
thank u.
 

If i did

Mov DPTR,#2020h
MOV R0, #10
MOVX A,@DPH
MOV R2, A
MOVx A,@DPL
Mov R3, A

would this do what I have described? As in scanning the array of 16 consecutive numbers from external memory starting at a location (lets say 2020h) and returns the high byte of the maximum unsigned value on R2 and the low byte on R3?
 

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