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H8/3021 Datasheet(PDF) 258 Page - Renesas Technology Corp

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 258 Page - Renesas Technology Corp

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8. 16-Bit Integrated Timer Unit (ITU)
Rev.2.00 Mar. 22, 2007 Page 234 of 684
REJ09B0352-0200
• Output compare timing
The compare match signal is generated in the last state in which TCNT and the general register
match (when TCNT changes from the matching value to the next value). When the compare
match signal is generated, the output value selected in TIOR is output at the output compare
pin (TIOCA or TIOCB). When TCNT matches a general register, the compare match signal is
not generated until the next counter clock pulse.
Figure 8.22 shows the output compare timing.
N + 1
N
N
φ
TCNT input
clock
TCNT
GR
Compare
match signal
TIOCA,
TIOCB
Figure 8.22 Output Compare Timing
Input Capture Function: The TCNT value can be captured into a general register when a
transition occurs at an input capture/output compare pin (TIOCA or TIOCB). Capture can take
place on the rising edge, falling edge, or both edges. The input capture function can be used to
measure pulse width or period.
• Sample setup procedure for input capture
Figure 8.23 shows a sample procedure for setting up input capture.



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