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10.5
Sample Application
In the example below, the 8-bit timer is used to generate a pulse output with a selected duty cycle,
as shown in figure 10-9. The control bits are set as follows:
[1] In TCR, bit CCLR1 is cleared to 0 and bit CCLR0 is set to 1 so that the timer counter is
cleared when its value matches the constant in TCORA.
[2] In TCSR, bits OS3 to OS0 are set to B'0110, causing the output to change to 1 at a TCORA
compare match and to 0 at a TCORB compare match.
With these settings, the 8-bit timer provides output of pulses at a rate determined by TCORA with
a pulse width determined by TCORB. No software intervention is required.
H'FF
TCORA
TCORB
H'00
TMO
TCNT
Figure 10-9 Example of Pulse Output
Counter clear
Rev. 5.00, 12/03, page 399 of 1088
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