hd66100 Renesas Electronics Corporation., hd66100 Datasheet - Page 321
hd66100
Manufacturer Part Number
hd66100
Description
H8/3867 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.HD66100.pdf
(495 pages)
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Consequently, the receive margin in asynchronous mode can be expressed as shown in equation
(1).
M ={(0.5 –
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 [%]
However, this is only a computed value, and a margin of 20% to 30% should be allowed when
carrying out system design.
306
Internal
basic clock
Receive data
(RXD3x)
Synchronization
sampling timing
Data sampling
timing
= 46.875%
2N
Figure 10.21 Receive Data Sampling Timing in Asynchronous Mode
1
) –
D – 0.5
0
8 clock pulses
Start bit
N
– (L – 0.5) F} 100 [%]
16 clock pulses
..... Equation (2)
7
15 0
..... Equation (1)
D0
7
15 0
D1
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