Section 14 Timer Connection
Rev. 3.00 Jan 25, 2006 page 367 of 872
REJ09B0286-0300
14.4.6
Internal Synchronization Signal Generation (IHG/IVG/CL4 Signal Generation)
By using the timer connection facility, FRT, and TMR_Y, it is possible to automatically generate
internal signals (IHG and IVG signals) corresponding to the IHI and IVI signals. As the IHG
signal is synchronized with the rise of the IVG signal, the IHG signal period must be made a
divisor of the IVG signal period in order to keep it constant. In addition, the CL4 signal can be
generated in synchronization with the IHG signal.
The contents of OCRA in the FRT are updated by the automatic addition of the contents of
OCRAR or OCRAF, alternately, each time a compare-match occurs. A value corresponding to the
0 interval of the IVG signal is written in OCRAR, and a value corresponding to the 1 interval of
the IVG signal is written in OCRAF. The IVG signal is set by a compare-match after an OCRAR
addition, and reset by a compare-match after an OCRAF addition.
The IHG signal is the TMR_Y timer output. TMR_Y is set to count internal clock pulses, and to
be cleared on a TCORA compare-match, to fix the period and set the timer output. TCORB is set
so as to reset the timer output. The IVG signal is connected as the TMR_Y reset input (TMRI),
and the rise of the IVG signal can be treated in the same way as a TCORA compare-match.
The CL4 signal is a waveform that rises within one system clock period after the fall of the IHG
signal, and has an interval of 1 for 6 system clock periods.
Examples of TCR, TCSR, TCORA, and TCORB settings in TMR_Y, and TCR, OCRAR,
OCRAF, and TOCR settings in the FRT are shown in table 14.9, and the IHG signal/IVG signal
timing chart is shown in figure 14.8.
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...