Section 17 Serial Communication Interface with FIFO (SCIF)
Rev. 1.00 Apr. 28, 2008 Page 515 of 994
REJ09B0452-0100
17.4.2 Operation
in
Asynchronous Communication
Figure 17.2 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 17.2 Data Format in Serial Transmission/Reception
(Example with 8-Bit Data, Parity and 2 Stop Bits)
Содержание H8S/2100 Series
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