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Section 9 Timers
Rev. 6.00 Sep 12, 2006 page 257 of 526
REJ09B0326-0600
FRC Count Timing:
FRC is incremented by clock input. Bits CKS1 and CKS0 in TCRX can
select one of three internal clock sources (
φ
/2,
φ
/8,
φ
/32) or an external clock.
•
Internal clock
Bits CKS1 and CKS0 in TCRX select one of three internal clock sources (
φ
/2,
φ
/8,
φ
/32)
created by dividing the system clock (
φ
). Figure 9.20 shows the increment timing.
N – 1
FRC input
clock
φ
FRC
Internal
clock
N
N + 1
Figure 9.20 Increment Timing with Internal Clock
•
External clock
External clock input is selected when bits CKS1 and CKS0 are both set to 1 in TCRX. FRC
increments on the rising edge of the external clock. An external pulse width of at least 1.5
system clocks (
φ
) is necessary. Shorter pulses will not be counted correctly. Figure 9.21 shows
the timing.
N – 1
N
FRC input
clock
φ
FRC
FTCI
(external clock
input pin)
Figure 9.21 Increment Timing with External Clock
Содержание F-ZTAT H8/3642A Series
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Страница 21: ...Rev 6 00 Sep 12 2006 page xix of xx Appendix E Product Code Lineup 522 Appendix F Package Dimensions 524 ...
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Страница 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Страница 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Страница 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Страница 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Страница 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Страница 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...