Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Uživatelský manuál stáhnout pdf (Strana 142)

MAXQ Family User’s Guide:

MAXQ2010 Supplement

24-8

24.4.2 Utility ROM Example 2: Reading Constant Byte Data from Flash (Indirect

Function Call)

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 ... 137 138 139 140 141 142 143 144 145 146 147

Žádné komentáře

Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Uživatelský manuál Strana 142