Zilog Z8F0130 Manual de usuario descargar pdf (Pagina 124)

Using the Integrated Development Environment UM013037-1212

100

Zilog Developer Studio II – Z8 Encore!

User Manual

C run-time library functions) by compiling the function and then including the object mod-

ule name in this field. This is an alternative to including the source code for the revised

function explicitly in your project, which would also override the function in the default

run-time library.

C Start-Up Module

The buttons and checkbox in this area (which are not available for Assembly Only proj-

ects) control which start-up module is linked to your application. All C programs require

some initialization before the main function is called, which is typically done in a start-up

module.

Standard

If the

Standard button is selected, the precompiled start-up module shipped with ZDS II is

used. This standard start-up module performs a minimum amount of initialization to pre-

pare the run-time environment as required by the ANSI C Standard and also does some

Z8 Encore!-specific configuration such as interrupt vector table initialization. See the Lan-

guage Extensions section on page 194 for full details of the operations performed in the

standard start-up module.

Some of these steps carried out in the standard start-up module might not be required for

every application, so if code space is extremely tight, you might want to make some judi-

cious modifications to the start-up code. The source code for the start-up module is located

in the following file:

<ZDS Installation Directory>\src\boot\common\startupX.asm

In the above filepath, <ZDS Installation Directory> is the directory in which Zilog Devel-

oper Studio was installed. By default, this path is:

C:\Program Files\Zilog\ZDSII_Z8Encore!_<version>

In the above filepath, <version> may be 4.11.0 or 5.0.0. The X in startupX.asm is s

for the small model or

l for the large model.

Included in Project

If the

Included in Project button is selected, then the standard start-up module is not

linked to your application. In this case, you are responsible for including suitable start-up

code, either by including the source code in the

Project Workspace window or by includ-

ing a precompiled object module in the

Additional Object/Library Modules field. If you

modify the standard start-up module to tailor it to your project, you must select the

Included in Project button for your changes to take effect.

While you are responsible for writing your own start-up code when selecting this option,

ZDS II automatically inserts some needed linker commands into your linker command file.

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