OS_Byte 176 (changes)
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Programmer's OS Reference SWI Manuals Calls
» Part OS_Byte 15 – SWI Calls
» OS_Byte 176OS
» OS_Byte
» OS_Byte 176
OS_Byte 176
(SWI &06)
| Entry | |
|---|---|
| R0 | 176 (&B0) |
| R1 | EOR value |
| R2 | AND value |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | Value before being overwritten |
| R2 | Corrupted |
Use
The purpose of this call is to read or set the 50Hz counter.
Notes
This call reads or sets the “50Hz” counter, a 1 byte counter which is decreased every vSync. As a consequence the rate of this counter is actually mode and monitor dependent, and should not be used for accurate timing.
See also
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