Maxim-integrated MAXQ622 Manual do Utilizador descarregar pdf (Página 251)

A1-6 Maxim Integrated

MAXQ612/MAXQ622 User’s Guide

move DPC, ACC ; write the new mode value

push DP[1] ; save byte mode bits

move DP[1], DP[1] ; select DP[1] as the active source pointer by

; writing to the pointer register

move ACC, @DP[1] ; DP[1] is now properly configured properly to read

;

;... perform other operations here

;

pop DP[1] ; pop byte mode bits

move ACC, DPC ; get the current DPC value

or #DP1_WORD_MODE_OR_MASK

; change DP[1] to word mode by setting DPC.3 to 1

move DPC, ACC ; write the new mode value

pop DP[1] ; pop word mode bits

pop DPC ; restore the existing DPC value.

ret ;

****************************************************************************

Example 6, Basic Multiple Pointer Configuration with address assignment

just prior to pointer read.

Assumptions: We know the contents of DPC. DPC contains #1ch

(Word mode: DP[0], DP[1], BP[Offs], DP[0] is selected)

****************************************************************************

move DPC, #BP_WORD_MODE_OR_MASK|BP_WORD_MODE_OR_MASK

; change DP[1] to byte mode by setting DPC.3 to 0

move DP[1], #1234h ; writing an address to a pointer register selects that

; pointer as the active source.

move ACC, @DP[1] ; DP[1] is now properly configured properly to read

move DP[0], #5678h ; writing an address to a pointer register selects that

; pointer as the active source.

move ACC, @DP[0] ; DP[0] is now properly configured properly to read

****************************************************************************

Example 6a, Basic Multiple Pointer Configuration with address assignment

just prior to pointer read.

Assumptions: We know the contents of DPC. DPC contains #1ch

(Word mode: DP[0], DP[1], BP[Offs], DP[0] is selected)

****************************************************************************

move DPC, #BP_WORD_MODE_OR_MASK|BP_WORD_MODE_OR_MASK

; change DP[1] to byte mode by setting DPC.3 to 0

move DP[1], #1234h ; writing an address to a pointer register selects that

; pointer as the active source.

move DP[0], #5678h ; writing an address to a pointer register selects that

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