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Maxim Integrated 21-9

MAX31782 User’s Guide

Revision 0; 8/11

21.4 Utility ROM Examples

21.4.1 Reading Constant Word Data from Flash

UROM_moveDP0incequ08494h

moveDPC,#1Ch   ;Setallpointerstowordmode

moveDP[0],#(table+8000h) ;Pointto addressofdataasviewed

inthe UtilityROM

memorymap

lcall#UROM_moveDP0inc

moveA[0],GR   ;A[0]=1111h

lcall#UROM_moveDP0inc

moveA[1],GR   ;A[1]=2222h

lcall#UROM_moveDP0inc

moveA[2],GR   ;A[0]=3333h

lcall#UROM_moveDP0inc

moveA[3],GR   ;A[1]=4444h

sjump$

org0100h

table:

 dw1111h,2222h,3333h,4444h

21.4.2 Reading Constant Byte Data from Flash (Indirect

Function Call)

INDX_moveDP0incequ4

moveDPC,#1Ch   ;Setallpointerstowordmode

moveDP[0],#800Dh  ;FetchlocationoffunctiontablefromUtilityROM

moveBP,@DP[0]   ;Setbasepointertofunctiontablelocation

moveOffs,#INDX_moveDP0inc ;SetoffsettomoveDP0incentryintable

moveA[7],@BP[Offs]  ;GetaddressofmoveDP0incfunction

moveDPC,#00h   ;Setallpointerstobytemode

moveDP[0],#((table*2)+8000h);PointtoaddressofdataasviewedintheUtilityROMmemory

mapandconverttobytemodepointer

lcallA[7]    ;moveDP0inc

moveA[0],GR   ;A[0]=34h

lcallA[7]    ;moveDP0inc

moveA[1],GR   ;A[1]=12h

lcallA[7]    ;moveDP0inc

moveA[2],GR   ;A[2]=78h

lcallA[7]    ;moveDP0inc

moveA[3],GR   ;A[3]=56h

sjump$

org0100h

table:

 dw1234h,5678h

1 2 ... 217 218 219 220 221 222 223

MAX31782 User’s Guide 1

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