HD64F2145 Datasheet, PDF (281/829 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Section 11 16-Bit Free-Running Timer (FRT)
This LSI has an on-chip 16-bit free-running timer (FRT). 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.
11.1 Features
• Selection of four clock sources
One of the three internal clocks (ø/2, ø/8, or ø/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 capture channels
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.
• Seven independent interrupts
Two compare-match interrupts, four input capture interrupts, and one overflow interrupt can be
requested independently.
• 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.
TIM8FR1A_010020020700
Rev. 2.0, 08/02, page 241 of 788