Section 14 Timer Connection
Rev. 3.00 Jan 25, 2006 page 361 of 872
REJ09B0286-0300
14.4.3
8-Bit Timer Divided Waveform Period Measurement
The timer connection facility, TMR_1, and the free-running timer (FRT) can be used to measure
the period of an IHI signal divided waveform. Since TMR_1 can be cleared by a rising edge of the
inverted IVI signal, the rise and fall of the IHI signal divided waveform can be synchronized with
the IVI signal. This enables period measurement to be carried out efficiently.
To measure the period of an IHI signal divided waveform, TCNT in TMR_1 is set to count the
external clock (IHI signal) pulses and to be cleared on the rising edge of the external reset signal
(inverse of the IVI signal). The value to be used as the division factor is written in TCORA, and
the TMO output method is specified by the OS bits in TCSR.
Examples of TCR and TCSR settings in TMR_1, and TCR and TCSR settings in the FRT are
shown in table 14.6, and the timing chart for measurement of the IVI signal and IHI signal divided
waveform periods is shown in figure 14.5. The period of the IHI signal divided waveform is given
by (ICRD(3) – ICRD(2))
×
resolution.
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...