HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 470
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HD6417144
Manufacturer Part Number
HD6417144
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417144.pdf
(930 pages)
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13. Serial Communication Interface (SCI)
13.4
Figure 13.2 shows the general format for asynchronous serial communication. One frame consists
of a start bit (low level), followed by data, a parity bit, and finally stop bits (high level). In
asynchronous serial communication, the transmission line is usually held in the mark state (high
level). The SCI monitors the communication line, and when it goes to the space state (low level),
recognizes a start bit and starts serial communication. Inside the SCI, the transmitter and receiver
are independent units, enabling full-duplex communication. Both the transmitter and the receiver
also have a double-buffered structure, so that data can be read or written during transmission or
reception, enabling continuous data transfer. In asynchronous mode, the SCI performs
synchronization at the falling edge of the start bit in reception. The SCI samples the data on the
8th pulse of a clock with a frequency of 16 times the length of one bit, so that the transfer data is
latched at the center of each bit.
Rev.4.00 Mar. 27, 2008 Page 426 of 882
REJ09B0108-0400
Figure 13.2 Data Format in Asynchronous Communication (Example with 8-Bit Data,
Serial
data
Operation in Asynchronous Mode
1
Start
1 bit
bit
0
LSB
D0
One unit of transfer data (character or frame)
D1
D2
Parity, Two Stop Bits)
Transmit/receive data
D3
7 or 8 bits
D4
D5
D6
MSB
D7
Parity
1 bit
none
0/1
or
bit
1 or 2 bits
1
Stop bit
1
(mark state)
Idle state
1
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