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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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The AT89C51 provides the following standard features: Overflow flagOV. DA A decimal adjust. SJMP offset short jump. The is designed as a Harvard architecture with segregated memory Data and Instructions ; it can only execute code fetched from program memory, and has no instructions to write to program memory.

RL A rotate left. 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. They were identical except for the non-volatile memory type. ORL addressA. For the former, the most significant bit of the accumulator can be addressed directly, as it is a bit-addressable SFR.

Intel MCS – Wikipedia

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.


ORL Cbit.

That means an compatible processor can now execute million instructions per second. The main program then performs serial reads and writes simply by reading and writing 8-bit data to stacks. As a conclusion, the architecture has not been altered, because instructoon way in which the memory is connected to the processor follows the same principle defined in the basic architecture.

Intel MCS-51

The absolute memory address is formed by the high 5 bits of the PC and the 11 bits defined by the instruction. The programmer consists of a hardware unit and.

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The last digit can indicate memory size, e. They can not be accessed indirectly via R0 or R1; indirect access to those addresses will access the second half of IRAM. The only register on an that is not memory-mapped is the bit program counter PC. Most modern compatible microcontrollers include instduction features.


Set when banks at 0x08 or 0x18 are in use. It may be on- or off-chip, depending on the particular model of chip being used. No abstract text available Text: JNB bitoffset jump if bit clear. Views Read Edit View history. The 32 bytes from 0x00—0x1F memory-map the 8 registers R0—R7.

AT89C51 INSTRUCTIONS SET datasheet & applicatoin notes – Datasheet Archive

Not all support all addressing modes; the immediate mode in particular is unavailable where the flexible operand is written to. The irregular instructions comprise 64 opcodes, having more limited addressing modes, plus several opcodes scavenged from inapplicable modes in the regular instructions.

Any bit of these bytes may be directly accessed by a variety of logical operations and conditional branches. This section needs expansion. MOV Adata. Set when addition produces a carry from bit 3 to bit 4.

8051 Instruction Set

Archived from the original on The MCS family was also discontinued by Intel, but is widely available in binary compatible and partly enhanced variants from many manufacturers. The on-chip Flash allows the program memory to be reprogrammed in-system or by aeffective solution to many embedded control applications. From Wikipedia, the free encyclopedia. RLC A rotate left through carry.