Operation In Event Count Mode - Fujitsu MB90895 Series Hardware Manual

8.5.2

Operation in Event Count Mode

In the event count mode, after the 16-bit reload timer is started, the edge of the signal
input to the TIN pin is detected to perform the count operation of the 16-bit timer
register (TMR).When the operation mode and reload mode are set, a rectangular wave
or a toggle wave is output from the TOT pin.
I Setting of Event Count Mode
• The 16-bit reload timer (TMRLR) is placed in the event count mode by setting the count clock select
bits in the timer control status register (TMCSR: CSL1, CSL0) to "11
• In the event count mode, the TMR decrements in synchronization with the edge detection of the external
event clock input to the TIN pin.
[Setting initial value of counter]
After the 16-bit reload timer is started, the value set in the TMRLR is reloaded to the TMR.
1. Disables the operation of the 16-bit reload timer (TMCSR: CNTE = 0).
2. Sets a reload value to the TMR in the TMRLR.
3. Enables the operation of the 16-bit reload timer (TMCSR: CNTE = 1).
Note: It takes 1 machine cycle (time) to load the value set in the TMRLR to the TMR after the start
trigger is input.
CHAPTER 8 16-bit reload timer
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