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HD64F2149YV bảng dữ liệu(PDF) 394 Page - Renesas Technology Corp

tên linh kiện HD64F2149YV
Giải thích chi tiết về linh kiện  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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HD64F2149YV bảng dữ liệu(HTML) 394 Page - Renesas Technology Corp

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Section 12 8-Bit Timers
Rev. 3.00 Jan 18, 2006 page 366 of 1044
REJ09B0280-0300
12.3
Operation
12.3.1
TCNT Incrementation Timing
TCNT is incremented by input clock pulses (either internal or external).
Internal Clock: An internal clock created by dividing the system clock (
φ) can be selected by
setting bits CKS2 to CKS0 in TCR. Figure 12.2 shows the count timing.
φ
Internal clock
TCNT input
clock
TCNT
N – 1
N
N + 1
Figure 12.2 Count Timing for Internal Clock Input
External Clock: Three incrementation methods can be selected by setting bits CKS2 to CKS0 in
TCR: at the rising edge, the falling edge, and both rising and falling edges.
Note that the external clock pulse width must be at least 1.5 states for incrementation at a single
edge, and at least 2.5 states for incrementation at both edges. The counter will not increment
correctly if the pulse width is less than these values.
Figure 12.3 shows the timing of incrementation at both edges of an external clock signal.



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