HCS08 datasheet(181/316 Pages) NXP

181 / 316 page

Modulo Timer (S08MTIMV1)

MC9S08SG8 MCU Series Data Sheet, Rev. 8

Freescale Semiconductor

181

12.1.2

Features

Timer system features include:

•

8-bit up-counter

— Free-running or 8-bit modulo limit

— Software controllable interrupt on overflow

— Counter reset bit (TRST)

— Counter stop bit (TSTP)

•

Four software selectable clock sources for input to prescaler:

— System bus clock — rising edge

— Fixed frequency clock (XCLK) — rising edge

— External clock source on the TCLK pin — rising edge

— External clock source on the TCLK pin — falling edge

•

Nine selectable clock prescale values:

— Clock source divide by 1, 2, 4, 8, 16, 32, 64, 128, or 256

12.1.3

Modes of Operation

This section defines the MTIM’s operation in stop, wait and background debug modes.

12.1.3.1

MTIM in Wait Mode

The MTIM continues to run in wait mode if enabled before executing the WAIT instruction. Therefore,

the MTIM can be used to bring the MCU out of wait mode if the timer overflow interrupt is enabled. For

lowest possible current consumption, the MTIM should be stopped by software if not needed as an

interrupt source during wait mode.

12.1.3.2

MTIM in Stop Modes

The MTIM is disabled in all stop modes, regardless of the settings before executing the STOP instruction.

Therefore, the MTIM cannot be used as a wake up source from stop modes.

Waking from stop1 and stop2 modes, the MTIM will be put into its reset state. If stop3 is exited with a

reset, the MTIM will be put into its reset state. If stop3 is exited with an interrupt, the MTIM continues

from the state it was in when stop3 was entered. If the counter was active upon entering stop3, the count

will resume from the current value.

12.1.3.3

MTIM in Active Background Mode

The MTIM suspends all counting until the microcontroller returns to normal user operating mode.

Counting resumes from the suspended value as long as an MTIM reset did not occur (TRST written to a 1

or MTIMMOD written).

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