Section 14 Timer Connection
Rev. 3.00 Jan 25, 2006 page 359 of 872
REJ09B0286-0300
IHI signal
IHI signal is tested
at compare-match
Counter reset
caused by
IHI signal
Counter clear
caused by
TCNT overflow
At the 2nd compare-match,
IHI signal is not tested
PDC signal
TCNT
TCORB
(threshold)
Figure 14.2 Timing Chart for PWM Decoding
14.4.2
Clamp Waveform Generation (CL1/CL2/CL3 Signal Generation)
The timer connection facility and TMR_X can be used to generate signals with different duty
cycles and rising/falling edges (clamp waveforms) in synchronization with the input signal (IHI
signal). Three clamp waveforms can be generated: the CL1, CL2, and CL3 signals. In addition, the
CL4 signal can be generated using TMR_Y.
The CL1 signal rises simultaneously with the rise of the IHI signal, and when the CL1 signal is
high, the CL2 signal rises simultaneously with the fall of the IHI signal. The fall of both the CL1
and CL2 signals can be specified by TCORA.
The rise of the CL3 signal can be specified as simultaneous with the sampling of the fall of the IHI
signal using the system clock, and the fall of the CL3 signal can be specified by TCORC. The CL3
signal can also fall when the IHI signal rises.
TCNT in TMR_X is set to count 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 CL1 signal pulse width is written in TCORA. Write a value of H'02 or
more in TCORA when internal clock
φ
is selected as the TMR_X counter clock, and a value or
H'01 or more when
φ
/2 is selected. When internal clock
φ
is selected, the CL1 signal pulse width is
(TCORA set value + 3 ± 0.5). When the CL2 signal is used, the setting must be made so that this
pulse width is greater than the IHI signal pulse width.
The value to be used as the CL3 signal pulse width is written in TCORC. TICR in TMR_X
captures the value of TCNT at the inverse of the external reset signal edge (in this case, the falling
edge of the IHI signal). The timing of the fall of the CL3 signal is determined by the sum of the
Summary of Contents for H8S/2158
Page 10: ...Rev 3 00 Jan 25 2006 page viii of lii...
Page 36: ...Rev 3 00 Jan 25 2006 page xxxiv of lii B Product Lineup 863 C Package Dimensions 864 Index 865...
Page 47: ...Rev 3 00 Jan 25 2006 page xlv of lii Appendix Figure C 1 Package Dimensions TBP 112A 864...
Page 54: ...Rev 3 00 Jan 25 2006 page lii of lii...
Page 70: ...Section 1 Overview Rev 3 00 Jan 25 2006 page 16 of 872 REJ09B0286 0300...
Page 118: ...Section 3 MCU Operating Modes Rev 3 00 Jan 25 2006 page 64 of 872 REJ09B0286 0300...
Page 126: ...Section 4 Exception Handling Rev 3 00 Jan 25 2006 page 72 of 872 REJ09B0286 0300...
Page 198: ...Section 6 Bus Controller Rev 3 00 Jan 25 2006 page 144 of 872 REJ09B0286 0300...
Page 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Page 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Page 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Page 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Page 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
Page 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Page 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Page 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
Page 844: ...Section 27 Power Down Modes Rev 3 00 Jan 25 2006 page 790 of 872 REJ09B0286 0300...
Page 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Page 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...