User guide

SmartBook for Renesas R8C/Tiny Microcontrollers

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ters. Because of this facility, square waveform with differ-

ent primary and secondary width can be generated. Hence,

you get a variable duty cycle.

The output level during the primary and secondary width can

be defined for all these timers. Like other timers, different

input clock options are also available.

7.8 Programmable One Shot Generation Mode:

This mode generates one shot pulse of either high or low level at the

output pin. This pulse is activated by either software or the hardware trigger

signal. This one shot pulse is defined by the contents of the timer’s primary re-

load register.

This programmable one shot generating facility is available with these timers:

Timer Y, Timer Z and Timer RB.

This mode is discussed further using Timer Z.

For the Timer Z, the programmable one shot pulse is available at the TZO pin by

a software trigger through the program or an external trigger input signal at the

INT0 pin. The software trigger is initiated by setting TZOS bit to one level in the

TZSC register. After this active trigger signal, the timer starts counting down from

the value set by the TZPR register and the output gets the defined level till the

timing register underflows.

Programmable one

shot generation mode

generates one shot

pulse of either

high or low level

at the output

pin. This pulse is activated by

either software or the

hardware trigger

signal.