MC9S08SH8CSC 查看數據表（PDF） - Freescale Semiconductor

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MC9S08SH8CSC

HCS08 Microcontrollers

Freescale Semiconductor 

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 overfl w 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.

MC9S08SH8 MCU Series Data Sheet, Rev. 3

192

Freescale Semiconductor

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