Datasheet

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5-26 Copyright © 1999-2001 ARM Limited. All rights reserved. ARM DUI0058D
5.4.21 SYS_ELAPSED (0x30)
Returns the number of elapsed target ticks since the support code started execution. Use
SYS_TICKFREQ to determine the tick frequency.
Entry
On entry, r1 points to a two-word data block to be used for returning the number of
elapsed ticks:
word 1 The least significant word in the doubleword value.
word 2 The most significant word.
Return
On exit, :
• r0 contains –1 if r1 does point to a doubleword containing the number of elapsed
ticks. Multi-ICE does not support this SWI and always returns –1 in r0.
• r1 points to a doubleword (low-order word first) that contains the number of
elapsed ticks.
5.4.22 SYS_TICKFREQ (0x31)
Returns the tick frequency.
Entry
Register r1 must contain 0 on entry to this routine.
Return
On exit, r0 contains either:
• the number ticks per second
•–1 if the target does not know the value of one tick. Multi-ICE does not support
this SWI and always returns –1.