Freescale Semiconductor HCS08 Series, Reference Manual

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Modulo Timer (S08MTIMV1)
MC9S08JS16 MCU Series Reference Manual, Rev. 4
156 Freescale Semiconductor
10.4.1 MTIM Operation Example
This section shows an example of the MTIM operation as the counter reaches a matching value from the
modulo register.
Figure 10-8. MTIM counter overflow example
In the example of Figure 10-8 , 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
0xAA. When the counter, MTIMCNT, reaches the modulo value of 0xAA, the counter overflows to 0x00
and continues counting. The timer overflow flag, TOF, sets when the counter value changes from 0xAA
to 0x00. An MTIM overflow interrupt is generated when TOF is set, if TOIE = 1.
selected
clock source
MTIMCNT
MTIM clock
(PS=%0010)
MTIMMOD:
0xA
0xA7 0xA8 0xA9 0xAA 0x00 0x01
TOF