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Section 9 Timers
Rev. 6.00 Sep 12, 2006 page 225 of 526
REJ09B0326-0600
TCNTV Increment Timing:
TCNTV is incremented by an input (internal or external) clock.
•
Internal clock
One of six clocks (
φ
/128,
φ
/64,
φ
/32,
φ
/16,
φ
/8,
φ
/4) divided from the system clock (
φ
) can be
selected by bits CKS2 to CKS0 in TCRV0 and bit ICKS0 in TCRV1. Figure 9.4 shows the
timing.
N – 1
TCNTV
input
FRC
input
φ
TCNTV
Internal
clock
N
N – 1
Figure 9.4 Increment Timing with Internal Clock
•
External clock
Incrementation on the rising edge, falling edge, or both edges of the external clock can be
selected by bits CKS2 to CKS0 in TCRV0.
The external clock pulse width should be at least 1.5 system clocks (
φ
) when a single edge is
counted, and at least 2.5 system clocks when both edges are counted. Shorter pulses will not be
counted correctly.
Figure 9.5 shows the timing when both the rising and falling edges of the external clock are
selected.
Summary of Contents for F-ZTAT H8/3642A Series
Page 6: ...Rev 6 00 Sep 12 2006 page iv of xx ...
Page 8: ...Rev 6 00 Sep 12 2006 page vi of xx ...
Page 22: ...Rev 6 00 Sep 12 2006 page xx of xx ...
Page 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Page 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Page 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Page 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Page 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Page 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...