HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 808
HD6412373R
Manufacturer Part Number
HD6412373R
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
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Section 15 Serial Communication Interface (SCI, IrDA)
15.6
Figure 15.14 shows the general format for clocked synchronous communication. In clocked
synchronous mode, data is transmitted or received in synchronization with clock pulses. One
character of communication data consists of 8-bit data. In clocked synchronous serial
communication, data on the transmission line is output from one falling edge of the serial clock to
the next. In clocked synchronous mode, the SCI receives data in synchronization with the rising
edge of the serial clock. After 8-bit data is output, the transmission line holds the MSB state. In
clocked synchronous mode, no parity or multiprocessor bit is added. Inside the SCI, the
transmitter and receiver are independent units, enabling full-duplex communication by use of a
common clock. 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.
15.6.1
Either an internal clock generated by the on-chip baud rate generator or an external
synchronization clock input at the SCK pin can be selected, according to the setting of CKE1 and
CKE0 bits in SCR. When the SCI is operated on an internal clock, the serial clock is output from
the SCK pin. Eight serial clock pulses are output in the transfer of one character, and when no
transfer is performed the clock is fixed high.
Rev.7.00 Mar. 18, 2009 page 740 of 1136
REJ09B0109-0700
Figure 15.14 Data Format in Clocked Synchronous Communication (For LSB-First)
Note: * High except in continuous transfer
Operation in Clocked Synchronous Mode
Clock
Serial
Serial
clock
data
Don’t care
*
LSB
Bit 0
Bit 1
One unit of transfer data (character or frame)
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
MSB
Bit 7
Don’t care
*
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