Microcontroller Instruction Set. For interrupt response time information, refer to the hardware description chapter. Note: 1. Operations on SFR byte address Instruction Set. ♢ Introduction. ♢ CIP architecture and memory organization review. ♢ Addressing modes. ➢ Register addressing. ➢ Direct addressing. Instruction hex code. MOVE with immediate data. Hex. Bytes Instruction. 2. MOV A, #immediate. 3. MOV direct, #immediate. 2. MOV @R0, #.

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Data dependency Structural Control False sharing.

Instruction Set Manual: Instruction Set Manual

Single-core Multi-core Manycore Heterogeneous architecture. This page was last edited on 10 Augustat The binary-compatible Z80 later added prefix-codes to escape from this 1-byte limit and allow for a more powerful instruction set. Designers of RISC architectures strove to achieve a balance that they thought better.

It is ” orthogonal ” in the sense that the instruction type and the addressing mode vary independently. A fully orthogonal architecture may not be the most “bit efficient” architecture. Please help improve it or discuss these issues on the talk page. Please help improve this article by adding citations to reliable sources.

April Learn how and when to remove this template message. Conversely, befehldsatz must be in registers before it can be operated upon by the other instructions in the computer’s instruction set.

Unsourced material may be challenged and removed. Instruction processing Instruction set architectures. The same basic idea was employed for the Intelalthough, to allow for more radical extensions, binary -compatibility with the was not attempted here. Please help improve this section by adding citations to reliable sources.

8051 Microcontroller Instruction Set

This section does not cite any sources. Learn how and when to remove these template messages.

At the bit befehlssata, the person writing the assembler or debugging machine code would clearly befeehlssatz that symbolic instructions could become any of several different op-codes.

Retrieved from ” https: Articles that may contain original research from November All articles that may contain original research Articles needing additional references from April All articles needing additional references Articles with multiple maintenance issues Articles needing additional references from April All articles with specifically marked weasel-worded phrases Articles with specifically marked weasel-worded phrases from April In the late s research at IBM and similar projects elsewhere demonstrated that the majority of these “orthogonal” addressing modes were ignored by most programs.


Perhaps some of the 851 that were used to express the fully orthogonal instruction set could instead be used to express more virtual address bits or select from among more registers. Since the PDP was an octal-oriented 3-bit sub-byte machine addressing modes 0—7, registers R0—R7there were electronically 8 addressing modes.

Tomasulo algorithm Reservation station Re-order buffer Register renaming. Through the use of the Stack Pointer R6 and Program Counter R7 as referenceable registers, there were 10 conceptual addressing modes available.

However, the betehlssatz used still shows many traces from the and and Z80 ; for instance, single-byte encodings remain for certain frequent operations such as push and pop of registers and constants, and the primary accumulator, eaxemploy shorter encodings than the other registers on certain types of operations; observations like this are sometimes exploited for befehlsatz optimization in both compilers and hand written code.

Instruction Set

From Wikipedia, the free encyclopedia. It maintained some degree of non-orthogonality for the sake of high code density even though this was derided as being ” baroque ” by some computer scientists [ who?

Since addressing modes were identical, this made 13 electronic addressing modes, but as in the PDP, the use of the Stack Pointer R14 and Program Counter R15 created a total of over 15 conceptual addressing modes with the assembler program translating the source code into the actual stack-pointer or program-counter based addressing mode needed. This article needs additional citations for verification.

November Learn how and when to remove this template message. Motorola’s designers attempted to make the assembly language orthogonal while the underlying machine language was somewhat less so.

In these architectures, only a very few memory reference instructions can access main memory and only for the purpose of loading data into registers or storing register data back into main memory; only a few addressing modes may be available, and these modes may vary depending on whether the instruction refers to data or involves a transfer of control jump. Processor register Register file Memory buffer Program counter Stack.


This compromise gave almost the same convenience as a truly orthogonal machine, and yet also gave the CPU designers freedom to use the bits in the instructions befeylssatz efficiently than a purely orthogonal approach might have.

The bit extension of this architecture that was introduced with thewas 88051 more orthogonal despite keeping all the instructions and their extended counterparts. Every integer instruction could operate on either 1-byte or 2-byte integers and could access data stored in registers, stored as part of the instruction, stored in memory, or stored in memory and pointed to by addresses in registers.

By using this site, you agree to the Terms of Use and Privacy Policy. Please improve it by bsfehlssatz the claims made and adding inline citations. The 8-bit Intel as well as the and microprocessor was basically a slightly extended accumulator-based design and therefore not orthogonal.

Statements consisting only of original research should be removed. An brfehlssatz instruction set does not impose a limitation that requires a certain befehhlssatz to use a specific register. This was largely due to a desire to keep all opcodes one byte long. This trade off is made explicitly to enable the use of much larger register sets, extended virtual addresses, brfehlssatz longer immediate data data stored directly within the computer instruction.

Branch prediction Memory dependence prediction. Each component being one bytethe opcode a value in the range 0—, and each operand consisting of two nibblesthe upper 4 bits specifying bedehlssatz addressing mode, and the lower 4 bits usually specifying a register number R0—R This article possibly contains original research.

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With the exception of its floating point instructions, the PDP was very strongly orthogonal.