Epson S1C17001 Technical Manual page 131

11 16-BIT TIMER (T16)
D4 TRMD: Count Mode Select Bit
Selects the 16-bit timer count mode.
1 (R/W): One-shot mode
0 (R/W): Repeat mode (default)
Setting TRMD to 0 sets the 16-bit timer to Repeat mode. In this mode, once the count starts, the 16-bit
timer continues to run until stopped by the application. If the counter underflows, the timer presets the
counter to the reload data register value and continues the count. Thus, the timer periodically outputs an
underflow pulse. Set the 16-bit timer to this mode to generate periodic interrupts at desired intervals or
to generate a serial transfer clock.
Setting TRMD to 1 sets the 16-bit timer to One-shot mode. In this mode, the 16-bit timer stops
automatically as soon as the counter underflows. This means only one interrupt can be generated after
the timer starts. Note that the timer presets the counter to the reload data register value, then stops when
an underflow occurs. Set the 16-bit timer to this mode to set a specific wait time or for pulse width
measurement.
D1 PRESER: Timer Reset Bit
Resets the 16-bit timer.
1 (W): Reset
0 (W): Disabled
0 (R): Normally 0 when read out (default)
Writing 1 to this bit presets the counter to the reload data value.
D0 PRUN: Timer Run/Stop Control Bit
Controls the timer RUN/STOP.
1 (R/W): Run
0 (R/W): Stop (default)
The timer starts counting when PRUN is written as 1 and stops when written as 0. When the timer is
stopped, the counter data is retained until reset or until the next RUN state.
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S1C17001 TECHNICAL MANUAL