Mitsubishi Electric M32R Series User Manual page 439

Mitsubishi 32-bit risc single-chip microcomputers

Table of Contents

(2) Event count mode

In event count mode, the timer uses an external input signal (TIN24, TIN26, or TIN28) as the

clock source with which to operate the counter.

Note: TIN25, TIN27, and TIN29 cannot be used as the clock source.

By detecting rising and falling edges of the external input signal (TIN24, TIN26, or TIN28), the

timer generates clock pulses synchronized to the internal clock. When after setting the counter,

the timer is enabled (by writing to the enable bit in software), the counter starts counting up from

the set count value synchronously with the generated clock. An interrupt can be generated by a

counter overflow.

To stop the counter, disable count by writing to the enable bit in software or fix the external input

signal high or low.

Counter value 7FFF

Figure 10.7.4 Typical Operation in TID Event Count Mode (Basic Operation)

Counter value

TID interrupt

Figure 10.7.5 Typical Operation in TID Event Count Mode (when Overflow Occurs)

MULTIJUNCTION TIMERS

10.7 TID (Input-related 16-bit Timer)