HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 724

• Manufacturer Part Number: HD6412332
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

15.4
The following points should be noted when using the SCI as a smart card interface.
Receive Data Sampling Timing and Receive Margin in Smart Card Interface Mode: In smart
card interface mode, the SCI operates on a base clock with a frequency of 32, 64, 372, or 256
times the transfer rate (determined by bits BCP1 and BCP0).
In reception, the SCI samples the falling edge of the start bit using the base clock, and performs
internal synchronization. Receive data is latched internally at the rising edge of the 16th, 32nd,
186th, or 128th pulse of the base clock. Use of a 372-times clock is illustrated in figure 15.10.
Rev.4.00 Sep. 07, 2007 Page 694 of 1210
REJ09B0245-0400
Internal
base
clock
Receive
data (RxD)
Synchro-
nization
sampling
timing
Data
sampling
timing
Usage Notes
Figure 15.10 Receive Data Sampling Timing in Smart Card Mode
0
186 clocks
185
372 clocks
Start bit
(When Using 372-Times Clock)
371
0
D0
185
371 0
D1