MC9S08SH32CWL Datasheet, PDF (192/328 Pages) Freescale Semiconductor, Inc – MC9S08SH32 Series Features

Chapter 12 Modulo Timer (S08MTIMV1)
12.4.1 MTIM Operation Example
This section shows an example of the MTIM operation as the counter reaches a matching value from the
modulo register.
selected
clock source
MTIM clock
(PS=%0010)
MTIMCNT
$A7
$A8
$A9
$AA
$00
$01
TOF
MTIMMOD:
$AA
Figure 12-8. MTIM counter overflow example
In the example of Figure 12-8, the selected clock source could be any of the five possible choices. The
prescaler is set to PS = %0010 or divide-by-4. The modulo value in the MTIMMOD register is set to $AA.
When the counter, MTIMCNT, reaches the modulo value of $AA, the counter overflows to $00 and
continues counting. The timer overflow flag, TOF, sets when the counter value changes from $AA to $00.
An MTIM overflow interrupt is generated when TOF is set, if TOIE = 1.
MC9S08SH32 Series Data Sheet, Rev. 2
192
Freescale Semiconductor
PRELIMINARY