M68HC08 datasheet(155/332 Pages) FREESCALE

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Timer Interface Module (TIM)

MC68HC908JB16 — Rev. 1.1

Technical Data

Freescale Semiconductor

Timer Interface Module (TIM)

155

10.10.3 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: T1CNTL, $000D and T2CNTL, $0043

Bit 7

654321

Bit 0

Read:

Bit 7

654321

Bit 0

Write:

Reset:

00000000

= Unimplemented

Figure 10-6. TIM Counter Registers Low (TCNTL)

Address: T1MODH, $000E and T2MODH, $0044

Bit 7

654321

Bit 0

Read:

Bit 15

Bit 8

Write:

Reset:

11111111

Figure 10-7. TIM Counter Modulo Register High (TMODH)

Address: T1MODL, $000F and T2MODL, $0045

Bit 7

654321

Bit 0

Read:

Bit 7

654321

Bit 0

Write:

Reset:

11111111

Figure 10-8. TIM Counter Modulo Register Low (TMODL)

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