HD6473837H Datasheet, PDF (227/562 Pages) Renesas Technology Corp – Hardware Manual

9.6 Timer G
9.6.1 Overview
Timer G is an 8-bit timer, with input capture functions for separately capturing the rising edge and
falling edge of pulses input at the input capture pin (input capture input signal). Timer G has a
built-in noise canceller circuit that can eliminate high-frequency noise from the input capture
signal, enabling accurate measurement of its duty cycle. When timer G is not used for input
capture, it 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, φ_W/2)
• Input capture function
Separate input capture registers are provided for the rising and falling edges.
• Counter overflow detection
Can detect whether overflow occurred when the input capture signal was high or low.
• Choice of counter clear triggers
The counter can be cleared at the rising edge, falling edge, or both edges of the input capture
signal.
• Two interrupt sources
Interrupts can be requested by input capture and by overflow. For input capture, the rising or
falling edge can be selected.
• Built-in noise-canceller circuit
The noise canceller circuit can eliminate high-frequency noise in the input capture signal.
• Operates in subactive and subsleep modes
When φ_W/2 is selected as the internal clock source, timer G can operate in the subactive and
subsleep modes.
210