H838024 datasheet(339/697 Pages) RENESAS

339 / 697 page

Section 9 Timers

Rev. 7.00 Mar 10, 2005 page 297 of 652

REJ09B0042-0700

Table 9.14

Input Capture Input Signal Input Edges Due to Input Capture Input Pin

Switching, and Conditions for Their Occurrence

Input Capture Input

Signal Input Edge

Conditions

Generation of rising edge

When TMIG is modified from 0 to 1 while the TMIG pin is high

When NCS is modified from 0 to 1 while the TMIG pin is high, then

TMIG is modified from 0 to 1 before the signal is sampled five times by

the noise canceler

Generation of falling edge

When TMIG is modified from 1 to 0 while the TMIG pin is high

When NCS is modified from 0 to 1 while the TMIG pin is low, then

TMIG is modified from 0 to 1 before the signal is sampled five times by

the noise canceler

When NCS is modified from 0 to 1 while the TMIG pin is high, then

TMIG is modified from 1 to 0 after the signal is sampled five times by

the noise canceler

Note:

When the P13 pin is not set as an input capture input pin, the timer G input capture input

signal is low.

• Switching input capture input noise canceler function

When performing noise canceler function switching by modifying NCS in port mode register 2

(PMR2), which controls the input capture input noise canceler, TMIG should first be cleared to

0. Note that if NCS is modified without first clearing TMIG, an edge will be regarded as

having been input at the pin even though no valid edge has actually been input. Input capture

input signal input edges, and the conditions for their occurrence, are summarized in table 9.15.

Table 9.15

Input Capture Input Signal Input Edges Due to Noise Canceler Function

Switching, and Conditions for Their Occurrence

Input Capture Input

Signal Input Edge

Conditions

Generation of rising edge

When the TMIG pin is modified from 0 to 1 while TMIG is 1, then NCS

is modified from 0 to 1 before the signal is sampled five times by the

noise canceler

Generation of falling edge

When the TMIG pin is modified from 1 to 0 while TMIG is 1, then NCS

is modified from 1 to 0 before the signal is sampled five times by the

noise canceler

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