In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

John,
  Here is a routine to get a 16 bit result from multiplying two bytes:

DEVICE SX28,OSCXT1,OPTIONX,STACKX,TURBO
FREQ 4_000_000

A   VAR BYTE
B   VAR BYTE
LSB VAR BYTE
MSB VAR BYTE

PROGRAM Start NOSTARTUP

Start:
  A = 255
  B = 31
  ASM ' LSB,MSB = A * B
    MOV __PARAM1,A
    CLR MSB
    MOV LSB,#128                    
    RR __PARAM1                   
    MOV W,B                       
    SNC                           
    ADD MSB,W                
    RR MSB                   
    RR LSB                          
    JNC @$-6                
  ENDASM
  WATCH LSB,16,UDEC
END

Bean.

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