M68ICS08GR datasheet(353/408 Pages) FREESCALE

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Timer Interface Module (TIM)

I/O Registers

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Timer Interface Module (TIM)

353

22.10.3 TIM Counter Modulo Registers

The read/write TIM modulo registers contain the modulo value for the

TIM counter. When the TIM counter reaches the modulo value, the

overflow flag (TOF) becomes set, and the TIM counter resumes counting

from $0000 at the next timer clock. Writing to the high byte (TMODH)

inhibits the TOF bit and overflow interrupts until the low byte (TMODL) is

written. Reset sets the TIM counter modulo registers.

NOTE:

Reset the TIM counter before writing to the TIM counter modulo registers.

Address: T1MODH, $0023 and T2MODH, $002E

Bit 7

654321

Bit 0

Read:

Bit 15

Bit 8

Write:

Reset:

11111111

= Unimplemented

Figure 22-7. TIM Counter Modulo Register High (TMODH)

Address: T1MODL, $0024 and T2MODL, $002F

Bit 7

654321

Bit 0

Read:

Bit 7

654321

Bit 0

Write:

Reset:

11111111

= Unimplemented

Figure 22-8. TIM Counter Modulo Register Low (TMODL)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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