General microprocessors page 1

C Programming Options in AVR

hola ! ARM

Dely loop in AVR

How to access R0 to R7 registers in Keil C?

Please find the Below program to Pack the two unpacked BCD numbers stored in memory locations 4200H and 4201H and store result in memory location 4300H. Assume the least significant digit is stored at 4200H.

Here is the Sample problem:

(4200H) = 04

(4201H) = 09

Result = (4300H) = 94

Source program for the above logic

LDA 4201H : Get the Most significant BCD digit

RLC

RLC

RLC

RLC : Adjust the position of the second digit (09 is changed to 90)

ANI FOH : Make least significant BCD digit zero

MOV C, A : store the partial result

LDA 4200H : Get the lower BCD digit

ADD C : Add lower BCD digit

STA 4300H : Store the result

HLT : Terminate program execution