AN3350 datasheet(59/185 Pages) STMICROELECTRONICS

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AN3350

Working with the assembler

Doc ID 018512 Rev 2

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10.3

Assembly file layout

This section explains the assembly source file layout. eTPU assembly language includes

mnemonic operation codes for machine instructions in the microcontroller’s instruction set

and provides mnemonic directives for specifying assembler auxiliary actions. It also explains

how to define and use macro instructions with predefined statement sequences, and how to

use conditional assembly code.

10.3.1

Instructions, directives and packets

The eTPU processes (fetches and executes) 32 bits words. Each word contains one or more

instructions that are all executed in parallel (but see "parallelism issues" in the eTPU block

guide for exceptions). The set of instructions encoded into or decoded out of a single

memory word is called 'a packet'.

Note:

Another terminology is using the pair Instruction/Sub-instruction for referring to

Packet/Instruction respectively.

10.3.2

Syntax

Each instruction (or directive) appears in the code as a separate line. To combine several

instructions into a packet, one can either write the instructions in the same line or surround

them with curly braces ('{', '}'). Inside a packet, instructions are separated by the semicolon

char (';') or optionally (when braced) by the newline char. Eempty lines inside braced

packets are ignored.

For example, if I1 and I2 are instructions, the following are legal packets:

●

{ I1 }

●

I1 ; I2

●

{ I1 ; I2 }

●

{ I1

I2 }

●

{

I1 ;

}

Note:

Directives can not take part in packets.

Labels are not part of packets. they can only precede one.

Miscellaneous

options

-lint

Dump a list of detected possible errors to stderr

(no object file is created)

-extern

Assume all undefined symbols are external

-global

Assume all defined symbols are global

Reserved options

-ide

Reserved for IDE invocations

Table 4.

Assembler command-line switches (continued)

Options

Switch

Description

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