Section 15 Serial Communication Interface with FIFO (SCIF)
Rev. 1.00 Mar. 12, 2008 Page 527 of 1178
REJ09B0403-0100
15.4.2
Operation in Asynchronous Communication
Figure 15.2 illustrates the typical format for asynchronous serial communication. One frame
consists of a start bit (low level), followed by transmit/receive data (LSB-first: from the least
significant bit), a parity bit, and a stop bit (high level). In asynchronous serial communication, the
transmission line is usually held high in the mark state (high level). The SCIF monitors the
transmission line, and when it detects the space state (low level), recognizes a start bit and starts
serial communication. Inside the SCIF, the transmitter and receiver are independent units,
enabling full-duplex communication. Both of the transmitter and receiver also have a 16-stage
FIFO buffered structure so that data can be read or written during transmission or reception,
enabling continuous data transmission and reception.
Serial data
1
1
0
D0
D1
D2
D3
D4
D5
D6
D7
0/1
1
1
Idle state (mark state)
Transmit/receive data
Stop bit
1, 1.5,
or
2 bits
1 bit
1 bit
or
none
5, 6, 7, or 8 bits
Start
bit
Parity
bit
One unit of transfer data (character or frame)
Figure 15.2 Data Format in Serial Transmission/Reception
(Example with 8-Bit Data, Parity and 2 Stop Bits)
Содержание H8S Family
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Страница 206: ...Section 6 Bus Controller BSC Rev 1 00 Mar 12 2008 Page 158 of 1178 REJ09B0403 0100...
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Страница 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
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Страница 632: ...Section 17 Synchronous Serial Communication Unit SSU Rev 1 00 Mar 12 2008 Page 584 of 1178 REJ09B0403 0100...
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Страница 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Страница 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
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