Precautions On Using The 16-Bit Reload Timer - Fujitsu FR60 Hardware Manual

32-bit microcontroller mb91301 series

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CHAPTER 6 16-BIT RELOAD TIMER

Precautions on Using the 16-bit Reload Timer

This section contains precautions on using the 16-bit reload timer.

■ Precautions on Using the 16-bit Reload Timer

❍ Internal prescaler

The internal prescaler is enabled if a trigger (software or external trigger) is applied while bit1

(timer enable: CNTE) of the control status register (TMCSR) is set to "1".

❍ Timing of setting and clearing the interrupt request flag

If the device attempts to set and clear the interrupt request flag at the same time, the flag is set

and the clear operation becomes ineffective.

❍ 16-bit reload register (TMRLR)

If the device attempts to write to the 16-bit reload register and reload the data into the 16-bit

reload register at the same time, old data is loaded into the counter. New data is loaded into the

counter only in the next reload timing.

❍ 16-bit timer register (TMR)

If the device attempts to load and count the 16-bit timer register at the same time, the load

(reload) operation takes precedence.