h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 524

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 13 Serial Communication Interface (SCI)
Thus the reception margin in asynchronous mode is given by formula (1) below.
Where M : Reception margin (%)
Assuming values of F = 0 and D = 0.5 in formula (1), a reception margin of 46.875% is given by
formula (2) below.
When D = 0.5 and F = 0,
However, this is only the computed value, and a margin of 20% to 30% should be allowed in
system design.
Rev. 5.00 Sep 22, 2005 page 498 of 1136
REJ09B0257-0500
Internal basic
clock
Receive data
(RxD)
Synchronization
sampling timing
Data sampling
timing
N : Ratio of bit rate to clock (N = 16)
D : Clock duty (D = 0 to 1.0)
L : Frame length (L = 9 to 12)
F : Absolute value of clock rate deviation
M = | (0.5 –
M = (0.5 –
= 46.875%
Figure 13.21 Receive Data Sampling Timing in Asynchronous Mode
0
2 × 16
8 clocks
Start bit
2N
1
1
) × 100%
) – (L – 0.5) F –
16 clocks
7
| D – 0.5 |
15 0
N
(1 + F) | × 100%
D0
7
... Formula (2)
... Formula (1)
15 0
D1