PDF ST20-C1 Data sheet ( Hoja de datos )

Número de pieza	ST20-C1
Descripción	Instruction Set Reference Manual
Fabricantes	ST Microelectronics
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No Preview Available ! ST20-C1 Core Instruction Set Reference Manual ® 72-TRN-274-01 July 1997 1/205 1 page 1 Introduction 1.2 Manual structure The manual is divided into the following chapters: 1 This introduction chapter, which explains the structure of the book; 2 A notation chapter (Chapter 2) which explains the layout and notation conven- tions used in the instruction definitions and elsewhere; 3 An architecture chapter (Chapter 3), which explains the structure of the ST20- C1 core, the registers, memory addressing, the format of the instructions and the exception handling and process models; 4 Four chapters on using the instructions and how the instructions can be used to achieve certain useful outcomes: Chapter 4 on the general instructions; Chapter 5 on multiply-accumulate; Chapter 6 on interrupts and traps; and Chapter 7 on processes and support for multi-tasking. 5 An alphabetical listing of the instructions, one to a page (Chapter 8). Descrip- tions and formal definitions are presented in a standard format with the instruc- tion mnemonic and full name of the instruction at the top of the page. The notation used is explained in detail in Chapter 2. In addition there are appendices listing constants and structures, covering issues related to compiling for a ST20-C1 core and listing the instruction set plus a glossary for ST20-C1 terminology. 5/205 ® 5 Page 2 Notation represent an address which is offset by x words (4x bytes) from the address in register. For example, in the specification of load non-local there is: Areg′ ← word[Areg @ n] Here, Areg is loaded with the contents of the word that is n words from the address pointed to by Areg, i.e. the word at address Areg + 4n. In all cases, if the given base address has the correct alignment then any offset used will also give a correctly aligned address. 2.3 Operators used in the definitions A full list of the operators used in the instruction definitions is given in Table 2.1. Unless otherwise stated, all arithmetic is signed. Symbol Meaning Unchecked (modulo) integer arithmetic + Signed integer add, subtract, multiply, divide and remainder. If the computation − overflows the result of the operation is truncated to the word length. If a divide × or remainder by zero occurs the result of the operation is undefined. No errors / are signalled. The operator ‘−’ is also used as a monadic operator. rem Signed comparison operators < Comparisons of signed integer values: ‘less than’, ‘greater than’, ‘less than or > equal’, ‘greater than or equal’, ‘equal’ and ‘not equal’. ≤ ≥ = ≠ Bitwise operators ∼ ∧ ∨ ⊗ >> << >>arith ‘Not’, ‘and’, ‘or’, ‘exclusive or’, logical left and right shift and arithmetic right shift operations on bits in words. Boolean operators not Boolean combination in conditionals. and or Table 2.1 Operators used in the instruction descriptions Modulo operators Arithmetic is done using modulo arithmetic — i.e. there is no checking for errors and, if the calculation overflows, the result ‘wraps around’ the range of values representable in the word length of the processor — e.g. adding 1 to the address at the top of the 11/205 ® 11 Page

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Número de pieza	Descripción	Fabricantes
ST20-C1	Instruction Set Reference Manual	ST Microelectronics

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