Will this be useful ?

; CNVASCI  converts the lower nibble in accumulator to ASCI equivalent and returns Acc with converted value.
	
CNVASCI:	ANL	A,  #00FH	; Keep Only Low bits
		ADD	A,  #090H	; Add 144
		DA	A
		ADDC	A,  #040H	; Add  64
		DA	A	
		RET	

Raghu