Microprocessor Week2: Data Transfer
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This document provides information about data transfer instructions in MCS-51 assembly language. It describes instructions like MOV, MOVC, MOVX, PUSH, POP, and XCH that are used to move data between registers and memory. Parameters for instructions and examples of their usage are given. Diagrams illustrate how data is transferred with MOV, XCH, PUSH, POP, and XCHD instructions.
![Assembly Language
• Low-level programming
• Specific to physical computer architecture
Assembly Language structure
• [Header]
• [Program Instructions]
• [END Instruction]
MCS51 Instruction 32 April 2016](https://image.slidesharecdn.com/w2instructiondatatransfers04-160402130252/85/Microprocessor-Week2-Data-Transfer-3-320.jpg)
Microprocessor Week2: Data Transfer
- 1. MCS-51 Data Transfer Instructions MCS51 Instruction 12 April 2016
- 2. Developing 2 April 2016 MCS51 Instruction 2 Save / Load Build Assembly file (.asm) Hex file Emulator Circuit Simulator Microcontroller Board Assembly Editor
- 3. Assembly Language • Low-level programming • Specific to physical computer architecture Assembly Language structure • [Header] • [Program Instructions] • [END Instruction] MCS51 Instruction 32 April 2016
- 4. Assembly Language Sample ORG 00H MOV A, #45H ANL A, P1 ; Get status from sensors and process MOV R0, P2 ; Get setting Loop: MOV P3, A ; Send Output to Display unit DJNZ R0, Loop END MCS51 Instruction 42 April 2016
- 5. • Appendix 2: MCS-51 Instruction set 2 April 2016 MCS51 Instruction 5
- 6. Instruction set • MCS51 is 8 bit microcontroller, there for 28 or 256 difference instructions possible for CPU. • Types of instructions – Data Transfer Instruction – Logical Instruction – Arithmetic Instruction – Branch Instruction – Bit Operation Instruction MCS51 Instruction 62 April 2016
- 7. Machine Code 2 April 2016 MCS51 Instruction 7
- 8. Description of MCS51 instruction’s parameter • A • Rn • Ri • Rx (Ry) • Address • #X • #X16 • Rel • Bit • C MCS51 Instruction 82 April 2016
- 9. Data Transfer Instructions • These instructions move the content of one register to another one. The register which content is moved remains unchanged. If they have the suffix “X” (MOVX), the data is exchanged with external memory. • MOV • MOVC • MOVX • PUSH • POP • XCH MCS51 Instruction 92 April 2016
- 10. MOV A, Rn • MOV A, R3 • MOV A, 03h MCS51 Instruction 102 April 2016
- 11. MOV A, #X • MOV A, #78H • MOV A, #00101010B MCS51 Instruction 112 April 2016
- 12. MOV @Ri, #X • MOV @R1, #78H • MOV @R0, #00101010B MCS51 Instruction 122 April 2016
- 13. MOV DPTR, #XX • MOV DPTR, #78E5H • MOV DPTR, #1101010100101010B MCS51 Instruction 132 April 2016 78 E5 DPH DPL DPTR
- 14. MOV @Ri, A E E 0001 0002 0003 0004 0005 … 0 4 Ri Acc Data Memory Ri is R0 or R1 register MCS51 Instruction 142 April 2016 3 5 7 E 6 8 E E 5 F
- 15. MOV A, @Ri 6 8 0001 0002 0003 0004 0005 … 0 3 Ri Acc Data Memory Ri is R0 or R1 register MCS51 Instruction 152 April 2016 3 5 7 E 6 8 E E 5 F
- 16. XCH A, @Ri 1 5 0001 0002 0003 0004 0005 … 0 5 Ri Acc Data Memory Ri is R0 or R1 register MCS51 Instruction 162 April 2016 3 5 7 E 6 8 E E 5 F
- 17. PUSH Rx 1 5 0006 0007 0008 0009 000A 000B 0 7 SP Rx Data Memory Increase SP. then … To address SP+1 MCS51 Instruction 172 April 2016 0 D 0 0 1 5 0 0 0 0 0 0
- 18. POP Rx 4 B 0006 0007 0008 0009 000A 000B 0 A SP Rx Data Memory Then decrease SP. from address SP MCS51 Instruction 182 April 2016 0 D 0 0 1 5 E F 4 B 0 0
- 19. XCH A, Rn MCS51 Instruction 192 April 2016
- 20. XCHD A, @Ri 1 5 0001 0002 0003 0004 0005 0006 0 5 Ri Acc Data Memory Ri is R0 or R1 register MCS51 Instruction 202 April 2016 3 5 7 E 6 8 E E 3 F E 2