Maxim Integrated MAX-IDE MAXQ Microcontrollers - Manual (Page 6)

Table 1. hex_to_asc.asm: Converts Hex Data to Its Equivalent ASCII
;example to explain the usage of MAX-IDE
SEGMENT DATA ; DATA segment starts here
; Default location = 00
; Initialize Data memory
ch: DB 0 ;holds ASCII value of upper HEX nibble
ch1: DB 0 ;holds ASCII value of lower HEX nibble
ch2: DB 0 ;holds HEX byte
ch3: DB 0
SEGMENT CODE ; CODE segment starts here
ORG 0 ; SET Absolute address of code = 0
MAXQ30 EQU 3
MAXQ20 EQU 2
MAXQ10 EQU 1
;Choose MAXQ to be MAXQ10, MAXQ20 or MAXQ 30 depending
;on the architecture you want to use.
MAXQ EQU MAXQ30
; This example is with MAXQ30
IF(MAXQ=MAXQ30)
#define data_pointer DP[0].b
; for maxq30 , the data pointer is specified to be in byte mode or word mode
by using the
; notation DP[0].b or DP[0].w
ENDIF
IF(MAXQ=MAXQ20)
#define data_pointer DP[0]
MOVE DPC,#18h
; for maxq 20, the data pointer is specified to be in byte mode or word mode
through the
; DPC register
ENDIF
IF(MAXQ=MAXQ10)
#define data_pointer DP[0]
MOVE DPC,#18h
; for maxq 10, the data pointer is specified to be in byte mode or word mode
through the
; DPC register
ENDIF
JUMP main
ORG 20h ; SET Absolute address of code = 32
HEX
Hex2Asc:
MOVE A[1], A[0] ; store the HEX value for future use
MOVE DP[0], #ch2
MOVE @data_pointer, A[0] ; store the HEX value @ #ch2 location
MOVE A[0], A[1] ; Process upper nibble
MOVE AP,#0
SRA4
ADD #030h ; value = value + '0'
MOVE A[2],A[0]
SUB #03ah
MOVE A[0],A[2]
SJUMP C,??Hex2Asc_0
; if value > '9', value = value +
('A' - '9') + 1
ADD #07h
AND #0ffh
??Hex2Asc_0:
MOVE DP[0],#ch ; store ASCII value of upper HEX
nibble
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