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AT89LP6440 Datasheet(PDF) 26 Page - ATMEL Corporation |
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AT89LP6440 Datasheet(HTML) 26 Page - ATMEL Corporation |
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26 / 194 page  26 3706A–MICRO–9/09 AT89LP6440 - Preliminary A summary of data pointer instructions with fast context switching is listed inTable 5-2. 5.2.1 Data Pointer Update The Dual Data Pointers on the AT89LP6440 include two features that control how the data pointers are updated. The data pointer decrement bits, DPD1 and DPD0 in DPCF, configure the INC DPTR instruction to act as DEC DPTR. The resulting operation will depend on DPS as shown in Table 5-3. The data pointer update bits, DPU1 and DPU0, allow MOVX @DPTR and MOVC @DPTR instructions to update the selected data pointer automatically in a post-increment or post-decre- ment fashion. The direction of update depends on the DPD1 and DPD0 bits as shown in Table 5-4. Table 5-2. Data Pointer Instructions Instruction Operation DPS = 0 DPS = 1 JMP @A+DPTR JMP @A+DPTR0 JMP @A+DPTR1 MOV DPTR, #data16 MOV DPTR0, #data16 MOV DPTR1, #data16 MOV /DPTR, #data16 MOV DPTR1, #data16 MOV DPTR0, #data16 INC DPTR INC DPTR0 INC DPTR1 INC /DPTR INC DPTR1 INC DPTR0 MOVC A,@A+DPTR MOVC A,@A+DPTR0 MOVC A,@A+DPTR1 MOVC A,@A+/DPTR MOVC A,@A+DPTR1 MOVC A,@A+DPTR0 MOVX A,@DPTR MOVX A,@DPTR0 MOVX A,@DPTR1 MOVX A,@/DPTR MOVX A,@DPTR1 MOVX A,@DPTR0 MOVX @DPTR, A MOVX @DPTR0, A MOVX @DPTR1, A MOVX @/DPTR, A MOVX @DPTR1, A MOVX @DPTR0, A Table 5-3. Data Pointer Decrement Behavior DPD1 DPD0 Equivalent Operation for INC DPTR and INC /DPTR DPS = 0 DPS = 1 INC DPTR INC /DPTR INC DPTR INC /DPTR 0 0 INC DPTR0 INC DPTR1 INC DPTR1 INC DPTR0 0 1 DEC DPTR0 INC DPTR1 INC DPTR1 DEC DPTR0 1 0 INC DPTR0 DEC DPTR1 DEC DPTR1 INC DPTR0 1 1 DEC DPTR0 DEC DPTR1 DEC DPTR1 DEC DPTR0 Table 5-4. Data Pointer Auto-Update DPD1 DPD0 Update Operation for MOVX and MOVC (DPU1 = 1 & DPU0 = 1) DPS = 0 DPS = 1 DPTR /DPTR DPTR /DPTR 0 0 DPTR0++ DPTR1++ DPTR1++ DPTR0++ 0 1 DPTR0-- DPTR1++ DPTR1++ DPTR0-- 1 0 DPTR0++ DPTR1-- DPTR1-- DPTR0++ 1 1 DPTR0-- DPTR1-- DPTR1-- DPTR0-- |
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