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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The last digit can indicate memory size, e.

All Silicon Labssome Dallas and a few Atmel devices have single cycle cores. Flash Microcontroller Block Diagram Architecturalspecific device. Overflow flagOV. Most clones also have a full bytes of IRAM.

Register select 0, RS0. The programmer is controlled by software running on the host. ANL Cbit. More than 20 independent manufacturers produce MCS compatible processors. ANL addressdata. That means an compatible processor can now execute million instructions per second.

As of [update]new derivatives are still developed by many major chipmakers, and major compiler suppliers such as IAR SystemsKeil and Altium Tasking continuously release updates. A method is then shown by which the AT89C51 These kinds of bit zt89c51 are notof the AT89C51 core is aat89c51 in Figure 1. Some derivatives integrate a digital signal processor DSP. Bits are always specified by absolute addresses; there is no register-indirect or indexed addressing.


Instructions that operate on single bits are:. Not all support all addressing modes; the immediate mode in particular is unavailable where the flexible operand is written to.

IRAM from 0x00 to 0x7F can be accessed directly. ORL addressdata. The programmer consists of a hardware unit and.

NPTEL :: Electronics & Communication Engineering – Microcontrollers and Applications

Embedded system Programmable logic controller. One operand is flexible, while the second if any is specified by the operation: ADD Adata.

JNB bitoffset jump if bit clear. One feature of the core is the inclusion of a boolean processing engine which allows bit -level boolean logic operations to be carried out directly and efficiently on select internal registersports and select RAM locations.

Intel MCS-51

The AT89C51 provides the following standard features: The on-chip Flash allows the program memory to bewith Flash on a m onolithic chip, the Atmel AT89C51 is a powerful m icrocom puter which provides a. The MCS has four distinct types of memory — internal RAM, special function registers, program memory, and external data memory.

Design improvements have increased performance while retaining compatibility with the original MCS 51 instruction set. All AT89C51 func tions are supported, including code read, code write, chip erase, signature readfive or twelve volts, as set by the Vpp select function. JZ offset jump if zero. The irregular instructions comprise 64 opcodes, having more limited addressing modes, plus several opcodes scavenged from inapplicable modes in the regular instructions.


In other projects Wikimedia Commons. It can also be on- or off-chip; what makes it “external” is that it must be accessed using the MOVX move external instruction. JBC bitoffset jump if bit set with clear. The 32 bytes from 0x00—0x1F memory-map the 8 registers R0—R7.

Intel MCS – Wikipedia

Where the least significant nibble of the opcode specifies one of the following addressing modes, the most significant specifies the operation:. Retrieved 11 October The standard AT89C51 requires 12 volts for programming. This section needs expansion. To use this chip, external ROM had to be added containing the program that the would fetch and execute.

Set when banks at 0x10 or sef are in use. Archived from the original on 30 May Gives the parity XOR of the bits of the accumulator, A. MOV bitC.

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