M68ICS08GR datasheet(342/408 Pages) FREESCALE

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Timer Interface Module (TIM)

Technical Data

MC68HC908GR8 — Rev 4.0

342

Timer Interface Module (TIM)

MOTOROLA

•

When changing to a smaller value, enable channel x output

compare interrupts and write the new value in the output compare

interrupt routine. The output compare interrupt occurs at the end

of the current output compare pulse. The interrupt routine has until

the end of the counter overflow period to write the new value.

•

When changing to a larger output compare value, enable TIM

overflow interrupts and write the new value in the TIM overflow

interrupt routine. The TIM overflow interrupt occurs at the end of

the current counter overflow period. Writing a larger value in an

output compare interrupt routine (at the end of the current pulse)

could cause two output compares to occur in the same counter

overflow period.

22.5.5 Buffered Output Compare

Channels 0 and 1 can be linked to form a buffered output compare

channel whose output appears on the TCH0 pin. The TIM channel

registers of the linked pair alternately control the output.

Setting the MS0B bit in TIM channel 0 status and control register (TSC0)

links channel 0 and channel 1. The output compare value in the TIM

channel 0 registers initially controls the output on the TCH0 pin. Writing

to the TIM channel 1 registers enables the TIM channel 1 registers to

synchronously control the output after the TIM overflows. At each

subsequent overflow, the TIM channel registers (0 or 1) that control the

output are the ones written to last. TSC0 controls and monitors the

buffered output compare function, and TIM channel 1 status and control

TCH1, is available as a general-purpose I/O pin.

NOTE:

In buffered output compare operation, do not write new output compare

values to the currently active channel registers. User software should

track the currently active channel to prevent writing a new value to the

active channel. Writing to the active channel registers is the same as

generating unbuffered output compares.

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