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Microcontroller Instruction Set. For interrupt response time information, refer to the hardware description chapter. Note: 1. Operations on SFR byte address. The instruction set is optimized for 8-bit control applications. It provides a variety of fast addressing modes for accessing the internal RAM to facilitate byte. Instructions. has about instructions. These can be grouped into the following categories. Arithmetic Instructions; Logical Instructions; Data.

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ORL Adata. JNZ offset jump if non-zero.

There is also a two-operand compare and jump operation. Gives the parity XOR of the bits of the accumulator, A.

External data memory XRAM is a third address space, also starting at address 0, and allowing 16 bits of address space. In some engineering schools, the microcontroller is used in introductory microcontroller courses.

ADDC Adata. The ‘s predecessor, thewas used in the keyboard of the first IBM PCwhere it converted keypresses into the serial data stream which is sent to the main unit of the computer.

This page was last edited on 1 Decemberat The lower addresses may reside onchip. Instructions that operate on single bits are:.

AT89C51 INSTRUCTIONS SET datasheet & applicatoin notes – Datasheet Archive

Intel discontinued its MCS product line in March ; jnstruction [24] however, there are plenty of enhanced products or silicon intellectual property added regularly from other vendors. Views Read Edit View history. JB bitoffset jump if bit set. The programmer is controlled by wet running on the host. For the former, the most significant bit of the accumulator can be addressed directly, as it is a bit-addressable SFR. Since data could be in one of three memory spaces, a mechanism is usually provided to allow determining to which memory a pointer refers, either by constraining the pointer type to include the memory space, or by storing metadata with the pointer.


This part was available in a ceramic package with a clear quartz window over the top of the die so UV light could be used to erase the EPROM memory. Set when banks at 0x10 or 0x18 are in use. The SJMP short jump opcode takes the signed relative offset byte operand and transfers control there relative to instructiln address of the following instruction.

The MCS family was also discontinued by Intel, but is widely available in iinstruction compatible and partly enhanced variants. Single-board microcontroller Special function register. At89c15 a conclusion, the architecture has not been altered, because the way in which the memory is connected to the processor follows the same principle defined in the basic architecture. Carry bitC. Flash Microcontroller Block Diagram Architecturalspecific device.

Intel MCS – Wikipedia

The mnemonics for Accumulator-specific instructionshowever, refer to the Accumulator simply as Adivide operations. Retrieved 23 August The last digit can indicate memory size, e. IRAM from 0x00 to 0x7F can be accessed directly. It can also be on- or off-chip; what makes it “external” is that it must be accessed using the MOVX move external instruction.


There are many inatruction C compilers. From Wikipedia, the free encyclopedia. The programmer consists of a hardware unit and. Although the ‘s architecture is different to the traditional definition of this architecture; the buses to access both types of memory are the same; only the data bus, the address bus, and the control bus leave the processor.

Enhancements mostly include new peripheral features and expanded arithmetic instructions. They were identical except for the non-volatile memory type.

Register select 1, RS1.

8051 Instruction Set

ADD Adata. All AT89C51 func sett are supported, including code read, code write, chip erase, signature readfive or twelve volts, as set by the Vpp select function. Set when addition produces a signed overflow. By using this site, you agree to the Terms of Use and Privacy Policy. RLC A rotate left through carry.