Section 14 Serial Communication Interface with FIFO (SCIF)
Rev. 2.00 Mar 09, 2006 page 608 of 906
REJ09B0292-0200
In serial transmission, the SCIF operates as described below.
1. When data is written to SCFTDR, the SCIF transfers the data to SCTSR and starts
transmitting. Check that the TDFE flag is set to 1 in SC1SSR before writing transmit data to
SCFTDR. The number of data bytes that can be written is at least {16 – (transmit trigger set
number)}.
2. When data is transferred from SCFTDR to SCTSR and transmission is started, transmit
operations are performed continually until there is no transmit data left in SCFTDR. If the
number of data bytes in SCFTDR falls to or below the transmit trigger number set in SCFCR
during transmission, the TDFE flag is set to 1. If the TIE bit setting in SCSCR is 1 at this time,
a transmit-FIFO-data-empty interrupt (TXI) is requested.
The serial transmit data is sent from the TxD pin in the following order.
a. Start bit: One 0-bit is output.
b. Transmit data: 8-bit or 7-bit data is output in LSB-first or MSB-first order according to the
setting of the TLM bit in SC2SSR.
c. Multiprocessor bit: One multiprocessor bit (MPBT value) is output.
d. Stop bit(s): One or two 1-bits (stop bits) are output.
e. Mark state: 1 is output continuously until the start bit that starts the next transmission is
sent.
3. The SCIF checks for transmit data in SCFTDR at the timing for sending the stop bit. If there is
data in SCFTDR, it is transferred to SCTSR, the stop bit is sent, and then serial transmission of
the next frame is started.
If there is no transmit data in SCFTDR, the TEND flag is set to 1 in SC1SSR, the stop bit is
sent, and then the line goes to the mark state in which 1 is output continuously.
Figure 14.13 shows an example of SCIF operation for transmission using a multiprocessor
format.
Содержание SH7616
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Страница 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Страница 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Страница 662: ...Section 14 Serial Communication Interface with FIFO SCIF Rev 2 00 Mar 09 2006 page 636 of 906 REJ09B0292 0200 ...
Страница 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Страница 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Страница 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Страница 935: ...SH7616 Hardware Manual ...