Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual page 107

AGB Programming Manual
TM*CNT_H [d02] Count-Up Timing
With a setting of 0, count-up is performed in accordance with the prescalar
specification in [d01-00]. With a setting of 1, overflow of the timer channel
one number lower starts a count-up regardless of the prescalar
specification.
This mode is suitable for purposes such as time measurement over
relatively long periods.
The count-up timing specification is disabled for Timer 0, which counts up
in accordance with the prescalar specification.
TM*CNT_H [d01 - 00] Prescalar Selection
Allows selection of a prescalar based on the system clock (16.78MHz).
Setting
00
01
10
11
©1999 - 2001 Nintendo of America Inc.
Prescalar (Count-Up Interval)
System clock
64 cycles of system clock
256 cycles of system clock
1024 cycles of system clock
107
(59.595 ns)
( 3.814 s)
(15.256 s)
(61.025 s)
D.C.N. AGB-06-0001-002B4
Timer