Toshiba TLCS-900/H1 Series Manual page 283

Original cmos 32-bit microcontroller

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(Prescaler output clock )

(External trigger pulse)

Match with TB0RG1H/L

Timer output pin TB0OUT0

Enable inversioncaused by

loading to TB0CP0H/L

Figure 3.13.12 One-shot Pulse Output (without delay)

Frequency measurement

The frequency of the external clock can be measured in this mode. The clock is

input through the TB0IN0 pin, and its frequency is measured by the 8 bit timers

TMRA01 and the 16 bit timer/event counter (TMRB0).

The TB0IN0 pin input should be selected for the input clock of TMRB0. Set to

TB0MOD<TB0CPM1:0>="11". The value of the up counter is loaded into the

capture register TB0CP0H/L at the rising edge of the timer flip-flop TA1FF of 8bit

timers (TMRA01), and TB0CP1H/L at its falling edge.

The frequency is calculated by the difference between the loaded values in

TB0CP0H/L and TB0CP1H/L when the interrupt (INTTA0 or INTTA1) is

generated by either 8 bit timer.

(TB0IN0 pin input)

Loading to TB0CP0H/L

Loading to TB0CP1H/L

INTTA0/INTTA1

For example, if the value for the level 1 width of TA1FF of the 8 bit timer is set

to 0.5[s] and the difference between TB0CP0H/L and TB0CP1H/L is 100, the

frequency will be 100/0.5[s] =200[Hz].

Note: The frequency in this examole is calculated with 50% duty.

Load into capture register 0 (TB0CP0H/L)

INT6 occured

Inversion enable

Figure 3.13.13 Frequency Measurement

Load into capture register 1 (TB0CP1H/L)

INTTB01 occured

Disable inversion caused by loading into