Section 14 Timer Connection
Rev. 3.00 Jan 25, 2006 page 358 of 872
REJ09B0286-0300
14.4
Operation
14.4.1
PWM Decoding (PDC Signal Generation)
The timer connection facility and TMR_X can be used to decode a PWM signal in which 0 and 1
are represented by the pulse width. To do this, a signal in which a rising edge is generated at
regular intervals must be selected as the IHI signal.
The timer counter (TCNT) in TMR_X is set to count the internal clock pulses and to be cleared on
the rising edge of the external reset signal (IHI signal). The value to be used as the threshold for
deciding the pulse width is written in TCORB. The PWM decoder contains a delay latch which
uses the IHI signal as data and compare-match signal B (CMB) as a clock, and the state of the IHI
signal (the result of the pulse width decision) at the first compare-match signal B timing after
TCNT is reset by the rise of the IHI signal is output as the PDC signal.
The pulse width setting using TICRR and TICRF of TMR_X can be used to determine the pulse
width decision threshold. Examples of TCR and TCORB settings of TMR_X are shown in tables
14.4 and 14.5, and the PWM decoding timing chart is shown in figure 14.2.
Table 14.4 Examples of TCR Settings
Bit
Abbreviation
Contents
Description
7
6
5
CMIEB
CMIEA
OVIE
0
0
0
Interrupts due to compare-match and overflow are
disabled
4, 3
CCLR1, CCLR0
11
TCNT is cleared by the rising edge of the external
reset signal (IHI signal)
2 to 0
CKS2 to CKS0
001
Incremented on internal clock (
φ
)
Table 14.5 Examples of TCORB (Pulse Width Threshold) Settings
φφφφ
: 10 MHz
φφφφ
: 12 MHz
φφφφ
: 16 MHz
φφφφ
: 20 MHz
H'07
0.8 µs
0.67 µs
0.5 µs
0.4 µs
H'0F
1.6 µs
1.33 µs
1.0 µs
0.8 µs
H'1F
3.2 µs
2.67 µs
2.0 µs
1.6 µs
H'3F
6.4 µs
5.33 µs
4.0 µs
3.2 µs
H'7F
12.8 µs
10.67 µs
8.0 µs
6.4 µs
Содержание H8S/2158
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Страница 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Страница 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Страница 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
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Страница 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Страница 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
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Страница 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Страница 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...