HD64F38024HV Datasheet, PDF (305/684 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Super Low Power Series

Section 9 Timers
9.5 Timer G
9.5.1 Overview
Timer G is an 8-bit timer with dedicated input capture functions for the rising/falling edges of
pulses input from the input capture input pin (input capture input signal). High-frequency
component noise in the input capture input signal can be eliminated by a noise canceler, enabling
accurate measurement of the input capture input signal duty cycle. If input capture input is not set,
timer G functions as an 8-bit interval timer.
Features
Features of timer G are given below.
• Choice of four internal clock sources (φ/64, φ/32, φ/2, φw/4)
• Dedicated input capture functions for rising and falling edges
• Level detection at counter overflow
It is possible to detect whether overflow occurred when the input capture input signal was high
or when it was low.
• Selection of whether or not the counter value is to be cleared at the input capture input signal
rising edge, falling edge, or both edges
• Two interrupt sources: one input capture, one overflow. The input capture input signal rising
or falling edge can be selected as the interrupt source.
• A built-in noise canceler eliminates high-frequency component noise in the input capture input
signal.
• Watch mode, subactive mode, or subsleep mode operation is possible when φw/4 is selected as
the internal clock.
• Use of module standby mode enables this module to be placed in standby mode independently
when not used.
Rev. 8.00 Mar. 09, 2010 Page 283 of 658
REJ09B0042-0800