HCS08 datasheet(188/316 Pages) NXP

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Modulo Timer (S08MTIMV1)

MC9S08SG8 MCU Series Data Sheet, Rev. 8

188

Freescale Semiconductor

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.

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.

selected

clock source

MTIMCNT

MTIM clock

(PS=%0010)

MTIMMOD:

$AA

$A7

$A8

$A9

$AA

$00

$01

TOF

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