Bit handling instructions in 8051

 

 

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8051 Architectural Specification and Functional Description. 8031/8051/8751 SINGLE-COMPONENT 8-BIT MICROCOMPUTER. The 8051 has extensive facilities for binary and BCD arithmetic and excels in bit-handling capabilities. Efficient use of program memory results from an instruction set Jump if bit = 1 and clear bit. JZ (jump if A = 0) ? In this instruction, the content of the accumulator is checked. If it is zero, then the 8051 Unconditional Jump Instructions. There are two unconditional jumps in 8051 ?. LJMP (long jump) ? LJMP is 3-byte instruction in which the first byte represents _bit You can use data type bit or _bit for the type definition of scalars and for the return type of functions. _bitbyte You can declare byte variables in the However, since ROM is a different memory space (which needs special instructions to access), this is not possible for a 8051 C compiler. The 8051 micro-controller instructions are divided among five functional groups The MULAB instruction multiplies the accumulator by the data in the B register and puts the 16-bit product into the concatenated B (high-byte) and accumulator (low-byte) registers. A machine instruction is a machine code that can be executed by the machine. Detailed discussion of the machine instructions can be found in the hardware manuals of the 8051 or derivative microcontroller. bit-addressable RAM; accessed bit instructions. CALL INSTRUCTIONS Another control transfer instruction is the CALL instruction, which is used to call a subroutine. Subroutines are often used to This makes a program more structured in addition to saving memory space. In the 8051 there are two instructions for call: LCALL (long call) and ACALL The instruction set consists of instructions, native data types, addressing modes, interrupt registers, exceptional handling and memory architecture. The 8051 microcontroller instruction set provides the AND, OR, XOR, TEST, NOT and Boolean logic instructions for set and clears the bits based on Many 8051 instructions modify the bits of PSW. If your interrupt routine does not guarantee that PSW is In this case, the 8051 will analyze the contents of bit 45h. If the bit is set program execution will The interrupt handler performs whatever special functions are required to handle the event and then The 8051 microcontroller has only one data type. It is 8 bits, and the size of each register is also 8 bits. It is the job of the programmer to break down When executing the instruction "MOV R3, ttCOUNT", the register R3 will be loaded with the value 25 (notice the # sign). What is the advantage of using 8051 Instruction Set. ? Introduction ? CIP-51 architecture and memory organization review ? Addressing modes. O Register addressing O Direct addressing O Indirect addressing O Immediate constant addressing O Relative addressing O Absolute addressing O Long addressing O Indexed addressing. Instructions that take bit addresses (eg. Instructions will handle the addressing internally but, be careful thinking of them as 'different' memory spaces, they do overlap. SETB 01h will set the #1 bit in memory location 20h. Detailed description of all 8051 instructions: mnemonic, instruction name, instruction length, flags affected and instruction operation. Description of All Instructions. The following table lists the 8051 instructions sorted by opcode and the next table lists the 8051 instructions in the alphabetical order. Detailed description of all 8051 instructions: mnemonic, instruction name, instruction length, flags affected and instruction operation. Description of All Instructions. The following table lists the 8051 instructions sorted by opcode and the next table lists the 8051 instructions in the alphabetical order. Bit-addressable RAM The 8051 contains 210 bit-addressable locations, of which 128 are at byte addresses 20H through 2FH, and the rest are in the special function registers. The idea of individually accessing bits through software is a powerful feature of most microcontrollers.

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