ST20-C1 datasheet(28/205 Pages) STMICROELECTRONICS

Nome de Peças	ST20-C1

Descrição Electrónicos	Instruction Set Reference Manual

PDF	205 Pages

Scroll/Zoom	100%

Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	http://www.st.com

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3.4 Instruction encoding

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which is in turn encoded with the sequence:

pfix F; opr 9

3.4.5

Summary of encoding

The encoding mechanism has important consequences.

• It produces very compact code.

• It simplifies language compilation, by providing a completely uniform way of

allowing a primary instruction to take an operand of any size up to the proces-

sor word-length.

• It allows these operands to be represented in a form independent of the word-

length of the processor.

• It enables any number of secondary instructions to be implemented.

To aid clarity and brevity, prefix sequences and the use of

opr are not explicitly shown

in this guide. Each instruction is represented by a mnemonic, and for primary instruc-

tions an item of data, which stands for the appropriate instruction component

sequence. Hence the examples above would be just shown as:

ldc 17, add, and and.

Where appropriate, an expression may be placed in a code sequence to represent the

code needed to evaluate that expression.

ST20-C1 Folha de dados(PDF) 28 Page - STMicroelectronics