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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An assembly-language programmer or compiler writer had to be mindful of which operations were possible on each register: April Learn how and when to remove this template message.

Please help improve it or discuss these issues on the talk page. An orthogonal instruction set does not impose a limitation that requires a certain instruction to use a specific register. 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.

In many CISC computers, an instruction could access either registers or memory, usually in several different ways.

Instruction Set Manual: Instruction Set Manual

Since the PDP was an octal-oriented 3-bit sub-byte machine addressing modes 0—7, registers R0—R7there were electronically 8 addressing modes. Single-core Multi-core Manycore Heterogeneous architecture. This section does not cite any sources. Since addressing modes were identical, this made 13 electronic addressing modes, but as in the PDP, befehllssatz use of the Stack Befehlssatx 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.


From Wikipedia, the free encyclopedia.

The 8-bit Intel as well as the and microprocessor was basically a slightly extended accumulator-based design and therefore not orthogonal. Articles that may contain original research from November All articles that may contain original research Befehlssatz 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 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?

The same basic idea was employed for the Intelalthough, to allow for more radical extensions, binary -compatibility with the was not attempted here. Statements consisting only of original research should be removed.

Perhaps some of the bits that were used bedehlssatz express the fully orthogonal instruction set could instead be used to express more virtual address bits or select from among more registers.

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

Please help improve this section by adding citations to reliable sources. With the exception of its floating point instructions, the PDP was very strongly orthogonal. Even the PC and the stack pointer could be affected by the ordinary instructions using all of the ordinary data modes.

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Motorola’s designers attempted to make the assembly befehossatz orthogonal while the underlying machine language was somewhat less so. The Essentials of Computer Organization and Architecture.


Processor register Register file Memory buffer Program counter Stack. November Learn how and when to remove this template message. This page was last edited on 10 Augustat 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 more efficiently than a purely orthogonal approach might have.

It is ” orthogonal ” in the sense that the instruction type and the addressing mode vary independently. This article possibly contains original research. This article needs additional citations for verification. Through the use of the Stack Pointer R6 and Program Counter R7 as referenceable registers, there were 10 befhelssatz addressing modes available.

In computer engineeringan orthogonal instruction set is an instruction set architecture where all instruction types can use all addressing modes. Retrieved from ” https: The binary-compatible Z80 later added prefix-codes to escape from this 1-byte limit and allow for a more befehlssatz instruction set.

8051 Microcontroller Instruction Set

This trade off is made explicitly to enable the use of much larger register sets, extended virtual addresses, and longer immediate data data stored directly within the computer instruction.

Instruction processing Instruction set architectures. Unlike PDP, the MC used befehlseatz registers to store data and the addresses of data in memory.