H8SSLASH2214 datasheet(582/936 Pages) RENESAS

Il numero della parte	H8S/2214

Spiegazioni elettronici	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	936 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

Homepage	http://www.renesas.com

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582 / 936 page

Section 12 Serial Communication Interface (SCI)

Rev.4.00 Sep. 18, 2008 Page 522 of 872

REJ09B0189-0400

(6) Receive Error Flags and Transmit Operations (Clocked Synchronous Mode Only)

Transmission cannot be started when a receive error flag (ORER, PER, or FER) is set to 1, even if

the TDRE flag is cleared to 0. Be sure to clear the receive error flags to 0 before starting

transmission.

Note also that receive error flags cannot be cleared to 0 even if the RE bit is cleared to 0.

(7) Receive Data Sampling Timing and Reception Margin in Asynchronous Mode

In asynchronous mode, the SCI operates on a basic clock with a frequency of 16 times the transfer

rate.

In reception, the SCI samples the falling edge of the start bit using the basic clock, and performs

internal synchronization. Receive data is latched internally at the rising edge of the 8th pulse of the

basic clock. This is illustrated in figure 12.26.

Internal basic

clock

16 clocks

8 clocks

Receive data

(RxD)

Synchronization

sampling timing

Start bit

Data sampling

timing

15 0

Figure 12.26 Receive Data Sampling Timing in Asynchronous Mode

H8S/2214 Scheda tecnica(PDF) 582 Page - Renesas Technology Corp