Portable_Speed2 4 (changes)

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Programmer's Portable Reference Manuals

» Part 15 – SWI Calls

» Portable Portable_Speed2

» Portable_Speed2 4Portable_Speed2

Portable_Speed2 4

(SWI &42FCE)

Use

The purpose of this call is to return the number of different CPU speeds that are available.

Notes

Due to hardware restrictions or for performance reasons, most systems will only support a limited number of CPU clock rates. This call, along with Portable_Speed2 5 and Portable_Speed2 6 allow the user to enumerate the list of available clock rates. Index 0 is always the slowest available speed, and R0-1 is always the highest available speed.

To find the current CPU speed, see Portable_Speed2 0.

To set the CPU speed, see Portable_Speed2 2 or Portable_Speed2 8 (to set the desired ‘slow’ and ‘fast’ speeds), and Portable_Speed (to switch between the configured ‘slow’ and ‘fast’ speeds).

See also

• Portable SWI Calls
• Portable_Speed
• Portable_Speed2
• Portable_Speed2 0
• Portable_Speed2 2
• Portable_Speed2 5
• Portable_Speed2 8