TS80C52X2
ASSEMBLY LANGUAGE
; Block move using dual data pointers
; Destroys DPTR0, DPTR1, A and PSW
; note: DPS exits opposite of entry state
; unless an extra INC AUXR1 is added
;
00A2
;
AUXR1 EQU 0A2H
0000 909000MOV DPTR,#SOURCE
0003 05A2 INC AUXR1
0005 90A000 MOV DPTR,#DEST
; address of SOURCE
; switch data pointers
; address of DEST
0008
LOOP:
0008 05A2 INC AUXR1
; switch data pointers
000A E0
000B A3
000C 05A2 INC AUXR1
MOVX A,@DPTR
INC DPTR
; get a byte from SOURCE
; increment SOURCE address
; switch data pointers
000E F0
000F A3
0010 70F6 JNZ LOOP
0012 05A2 INC AUXR1
MOVX @DPTR,A
INC DPTR
; write the byte to DEST
; increment DEST address
; check for 0 terminator
; (optional) restore DPS
INC is a short (2 bytes) and fast (12 clocks) way to manipulate the DPS bit in the AUXR1 SFR. However,
note that the INC instruction does not directly force the DPS bit to a particular state, but simply toggles it.
In simple routines, such as the block move example, only the fact that DPS is toggled in the proper sequence
matters, not its actual value. In other words, the block move routine works the same whether DPS is '0' or '1'
on entry. Observe that without the last instruction (INC AUXR1), the routine will exit with DPS in the
opposite state.
12
Rev. B - Jan. 25, 1999
Preliminary
TEMIC [ TEMIC SEMICONDUCTORS ]
