R0K561622S000BE Renesas Electronics America, R0K561622S000BE Datasheet - Page 669

• Manufacturer Part Number: R0K561622S000BE
• Description: KIT STARTER FOR H8SX/1622
• Manufacturer: Renesas Electronics America
• Series: Renesas Starter Kits (RSK)r
• Type: MCUr

Specifications of R0K561622S000BE

• Contents: Board, Cables, CD, Debugger, Power Supply
• Silicon Manufacturer: Renesas
• Features: Coding And Debugging, E10A Emulator, RS232 Serial Connection
• Kit Contents: Board
• Silicon Family Name: H8SX/1622F
• Silicon Core Number: R5F61622N50LGV
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: H8SX/1622
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

16.4.2
In asynchronous mode, the SCI operates on a basic clock with a frequency of 16 times the bit rate.
In reception, the SCI samples the falling edge of the start bit using the basic clock, and performs
internal synchronization. Since receive data is sampled at the rising edge of the 8th pulse of the
basic clock, data is latched at the middle of each bit, as shown in figure 16.3. Thus the reception
margin in asynchronous mode is determined by formula (1) below.
Assuming values of F = 0 and D = 0.5 in formula (1), the reception margin is determined by the
formula below.
However, this is only the computed value, and a margin of 20% to 30% should be allowed in
system design.
Internal
basic clock
Receive data
(RxD)
Synchronization
sampling timing
Data sampling
timing
M = (0.5 –
M = ( 0.5 –
M: Reception margin
N: Ratio of bit rate to clock (N = 16)
D: Duty cycle of clock (D = 0.5 to 1.0)
L: Frame length (L = 9 to 12)
F: Absolute value of clock frequency deviation
Receive Data Sampling Timing and Reception Margin in Asynchronous Mode
Figure 16.3 Receive Data Sampling Timing in Asynchronous Mode
2 × 16
2N
0
1
1
) – (L – 0.5) F –
8 clocks
Start bit
) × 100[%] = 46.875%
16 clocks
7
| D – 0.5 |
N
15 0
Section 16 Serial Communication Interface (SCI)
(1 + F )
Rev. 2.00 Sep. 16, 2009 Page 639 of 1036
D0
× 100
7
[%]
... Formula (1)
REJ09B0414-0200
15 0
D1