TIM8FR1A_000020020300
Rev. 1.00, 09/03, page 239 of 704
Section 10 16-Bit Free-Running Timer (FRT)
This LSI has an on-chip 16-bit free-running timer (FRT) with two channels. The FRT operates on
the basis of the 16-bit free-running counter (FRC), and outputs two independent waveforms, and
measures the input pulse width and external clock periods.
10.1 Features
•
Selection of four clock sources
One of the three internal clocks (
φ
/2,
φ
/8, or
φ
/32), or an external clock input can be selected
(enabling use as an external event counter).
•
Two independent comparators
Two independent waveforms can be output.
•
Four independent input captures
The rising or falling edge can be selected.
Buffer modes can be specified.
•
Counter clearing
The free-running counters can be cleared on compare-match A.
•
Fourteen independent interrupts
Two compare-match interrupts, four input capture interrupts, and one overflow interrupt can be
requested independently for each channel.
•
Special functions provided by automatic addition function
The contents of OCRAR and OCRAF can be added to the contents of OCRA automatically,
enabling a periodic waveform to be generated without software intervention. The contents of
ICRD can be added automatically to the contents of OCRDM
×
2, enabling input capture
operations in this interval to be restricted.
Figure 10.1 shows a block diagram of the FRT.
Summary of Contents for H8S/2437
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