Keil Logo

SPACE or FILL

12.64 SPACE or FILL

The SPACE directive reserves a zeroed block of memory. The FILL directive reserves a block of memory to fill with a given value.

Syntax

{label} SPACE expr
{label} FILL expr{,value{,valuesize}}
where:
label
is an optional label.
expr
evaluates to the number of bytes to fill or zero.
value
evaluates to the value to fill the reserved bytes with. value is optional and if omitted, it is 0. value must be 0 in a NOINIT area.
valuesize
is the size, in bytes, of value. It can be any of 1, 2, or 4. valuesize is optional and if omitted, it is 1.

Usage

Use the ALIGN directive to align any code following a SPACE or FILL directive.
% is a synonym for SPACE.

Example

        AREA    MyData, DATA, READWRITE
data1   SPACE   255       ; defines 255 bytes of zeroed store
data2   FILL    50,0xAB,1 ; defines 50 bytes containing 0xAB
Related concepts
Non-ConfidentialPDF file icon PDF versionARM DUI0379H
Copyright © 2007, 2008, 2011, 2012, 2014-2016 ARM. All rights reserved. 
  Arm logo
Important information

This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies.

Change Settings

Privacy Policy Update

Arm’s Privacy Policy has been updated. By continuing to use our site, you consent to Arm’s Privacy Policy. Please review our Privacy Policy to learn more about our collection, use and transfers
of your data.