Operation; Figure 9.10 Noise Canceler Timing (Example) - Renesas H8/3847R Series Hardware Manual

Section 9 Timers
Therefore, after making a setting for use of the noise cancellation function, a pulse with at least
five times the width of the sampling clock is a dependable input capture signal. Even if noise
cancellation is not used, an input capture input signal pulse width of at least 2φ or 2φ
necessary to ensure that input capture operations are performed properly
Note: * An input capture signal may be generated when the NCS bit is modified.
Figure 9.10 shows an example of noise canceler timing.
In this example, high-level input of less than five times the width of the sampling clock at the
input capture input pin is eliminated as noise.
Input capture
input signal
Sampling clock
Noise canceler
output
9.5.4

Operation

Timer G is an 8-bit timer with built-in input capture and interval functions.
1. Timer G Functions
Timer G is an 8-bit up-counter with two functions, an input capture timer function and an interval
timer function.
The operation of these two functions is described below.
a. Input capture timer operation
When the TMIG bit is set to 1 in port mode register 1 (PMR1), timer G functions as an
input capture timer*.
Rev. 6.00 Aug 04, 2006 page 302 of 680
REJ09B0145-0600
Eliminated as noise

Figure 9.10 Noise Canceler Timing (Example)

is
SUB