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SH7708 데이터시트(PDF) 437 Page - Renesas Technology Corp

부품명 SH7708
상세설명  SuperH??RISC engine
PDF  633 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7708 데이터시트(HTML) 437 Page - Renesas Technology Corp

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419
0
185
371 0
185
371 0
Base clock
Receive
data (RxD)
Synchro-
nization
sampling
timing
Data
sampling
timing
186 clock cycles
372 clock cycles
Start
bit
D0
D1
Figure 14.8 Receive Data Sampling Timing in Smart Card Mode
The receive margin is found from the following equation:
For smart card mode:
M = (0.5 –
)
1
2N
D – 0.5
N
– (L – 0.5)F –
(1 + F)
× 100%
Where:
M = Receive margin (%)
N = Ratio of bit rate to clock (N = 372)
D = Clock duty (D = 0 to 1.0)
L = Frame length (L = 10)
F = Absolute value of clock frequency deviation
Using this equation, the receive margin when F = 0 and D = 0.5 is as follows:
M = (0.5 – 1/2
× 372) × 100% = 49.866%



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