HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 541

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Thus the reception margin in asynchronous mode is given by the following formula.
Where M: Reception margin (%)
Assuming values of F = 0 and D = 0.5 in the above formula, the reception margin formula is as
follows.
When D = 0.5 and F = 0,
Internal
basic
clock
Receive
data (RxD)
Synchro-
nization
sampling
timing
Data
sampling
timing
M = (0.5 – 1/2
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
M = | (0.5 –
= 49.866%
Figure 13.10 Receive Data Sampling Timing in Smart Card Mode
0
186 clocks
2N
185
1
372 clocks
372)
Start bit
) – (L – 0.5) F –
100%
371
0
| D – 0.5 |
D0
N
Rev.3.00 Mar. 26, 2007 Page 499 of 772
(1 + F) |
185
Section 13 Smart Card Interface
100%
371 0
REJ09B0355-0300
D1