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H838532H bảng dữ liệu(PDF) 357 Page - Renesas Technology Corp

tên linh kiện H838532H
Giải thích chi tiết về linh kiện  16-Bit Single-Chip Microcomputer H8 Family / H8/300H Super Low Power Series
PDF  508 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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H838532H bảng dữ liệu(HTML) 357 Page - Renesas Technology Corp

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Section 10 Serial Communication Interface
Rev. 1.00 May 30, 2008 Page 337 of 484
REJ09B0436-0100
0
7
15 0
7
15 0
Internal
basic clock
Receive data
(RXD3x)
Start bit
D0
16 clock pulses
8 clock pulses
D1
Synchronization
sampling timing
Data sampling
timing
Figure 10.16 Receive Data Sampling Timing in Asynchronous Mode
Consequently, the receive margin in asynchronous mode can be expressed as shown in equation
(1).
1
D – 0.5
M ={(0.5 –
2N
) –
N
– (L – 0.5) F}
× 100 [%]
..... Equation (1)
where
M: Receive margin (%)
N: Ratio of bit rate to clock (N = 16)
D: Clock duty (D = 0.5 to 1.0)
L: Frame length (L = 9 to 12)
F: Absolute value of clock frequency deviation
Substituting 0 for F (absolute value of clock frequency deviation) and 0.5 for D (clock duty) in
equation (1), a receive margin of 46.875% is given by equation (2).
When D = 0.5 and F = 0,
M = {0.5 — 1/(2
× 16)} × 100 [%]
= 46.875%
..... Equation (2)
However, this is only a computed value, and a margin of 20% to 30% should be allowed when
carrying out system design.



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