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Section 19 Serial Communication Interface with FIFO (SCIF)
Rev. 4.00 Sep. 14, 2005 Page 721 of 982
REJ09B0023-0400
19.4 Operation
19.4.1 Overview
For serial communication, the SCIF has an asynchronous mode in which characters are
synchronized individually, and a synchronous mode in which communication is synchronized with
clock pulses. The SCIF has a 16-byte FIFO buffer for both transmit and receive operations,
reducing the overhead of the CPU, and enabling continuous high-speed communication.
Moreover, it has
RTS
and
CTS
signals as modem control signals. The transmission format is
selected in the serial mode register (SCSMR). The SCIF clock source is selected by the
combination of the CKE1 and CKE0 bits in the serial control register (SCSCR).
Asynchronous Mode:
•
Data length is selectable: 7 or 8 bits
•
Parity bit is selectable. So is the stop bit length (1 or 2 bits). The combination of the preceding
selections constitutes the communication format and character length.
•
In receiving, it is possible to detect framing errors, parity errors, receive FIFO data full,
overrun errors, receive data ready, and breaks.
•
The number of stored data bytes is indicated for both the transmit and receive FIFO registers.
•
An internal or external clock can be selected as the SCIF clock source.
When an internal clock is selected, the SCIF operates using the on-chip baud rate
generator.
When an external clock is selected, the external clock input must have a frequency 16 times
the bit rate. (The on-chip baud rate generator is not used.)
Synchronous Mode:
•
The transmission/reception format has a fixed 8-bit data length.
•
In receiving, it is possible to detect overrun errors (ORER).
•
An internal or external clock can be selected as the SCIF clock source.
When an internal clock is selected, the SCIF operates using the on-chip baud rate
generator, and outputs a serial clock signal to external devices.
When an external clock is selected, the SCIF operates on the input serial clock. The on-
chip baud rate generator is not used.
Summary of Contents for HD6417641
Page 2: ...Rev 4 00 Sep 14 2005 Page ii of l...
Page 7: ...Rev 4 00 Sep 14 2005 Page vii of l...
Page 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
Page 12: ...Rev 4 00 Sep 14 2005 Page xii of l...
Page 28: ...Rev 4 00 Sep 14 2005 Page xxviii of l...
Page 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Page 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Page 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Page 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Page 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Page 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Page 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Page 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Page 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Page 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Page 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Page 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Page 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Page 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
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