Mcs 251 instruction set

MCS 251 microcontrollers feature an enriched instruction set, linear addressing, and. efficient C-language support. The 8XC251SA/SB/SP/SQ has 512 bytes or 1 Kbyte of on-chip RAM and is. available with 8 Kbytes or 16 Kbytes of on-chip ROM/OTPROM/EPROM INSTRUCTION SET REFERENCE INSTRUCTION SET SUMMARY This section summarizes the MCS 251 architecture instruction set. Tables A-19 through A-27 list the instructions by category, providing for each instruction a short description, its length in bytes, and its execution time in states. MCS-51 Instruction ARITHMETIC OPERATIONS Mnemonic Description Bytes Cycles ADD ADD ADD ADD ADDC ADDC ADDC ADDC SUBB SUBB Intel®, MCS® 51, MCS The Appendix includes information on the 8051 and MCS 251 instruction set, a summary of directives and controls, the Instruction Set In the MCS 51 architecture, the instruction opcode is encoded in one byte of hex code, which provides 256 possible combination of instructions. Running MCS 51 micrcontroller instructions alone in the 8XC251SB ensures binary code compatibility with MCS 51 microcontrollers. The Intel MCS-51 (commonly termed 8051) is a single chip microcontroller (MCU) series developed by Intel in 1980 for use in embedded systems. MCS 251 microcontrollers feature an enriched instruction set, linear addressing, and. efficient C-language support. The 8XC251SA/SB/SP/SQ has 512 bytes or 1 Kbyte of on-chip RAM and is. aavailable with 8 Kbytes or 16 Kbytes of on-chip ROM/OTPROM/EPROM, or without The MCS 251 controller completely supports all aspects of the standard 8051 instruction set and memory organization. This ensures that all existing 8051 programs will successfully execute on the MCS 251. The standard MCS-51 instruction set has 111 instructions with 64 of them executing in a single cycle. They can support up to 64k of external prgram, and 54k of external The Intel 8xC251TB/TQ and 8xC251SA/SB/SP/SQ are based on the new high performance MCS® 251 micro-controller architecture. 8XC251SB; ed MCS 51 Instruction Set — 16-bit and 32-bit Arithmetic and Logic Instructio ns — Compare and Conditional Jump Ins tructions — Expanded Set of Move Inst ructions s Linear Addressing s 256-Kbyt e Expanded External Code/Data Memory Sp ace s ROM/OTPROM/EPROM MCS 251 microcontrollers feature an enriched instruction set, linear addressing, and. efficient C-language support. The 8XC251SA/SB/SP/SQ has 512 bytes or 1 Kbyte of on-chip RAM and is. available with 8 Kbytes or 16 Kbytes of on-chip ROM/OTPROM/EPROM, or without Instruction set. Instructions are all 1 to 3 bytes long, consisting of an initial opcode byte, followed by up to 2 bytes of operands. The MCS-251 family was also discontinued by Intel, but is widely available in binary compatible and partly enhanced variants from many manufacturers.