HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 682

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 14 Serial Communication Interface (SCI)
Serial data reception (synchronous mode): Figure 14.18 shows a sample flowchart for serial
reception.
The following procedure should be used for serial data reception.
When changing the operating mode from asynchronous to synchronous, be sure to check that the
ORER, PER, and FER flags are all cleared to 0.
The RDRF flag will not be set if the FER or PER flag is set to 1, and neither transmit nor receive
operations will be possible.
Rev.6.00 Sep. 27, 2007 Page 652 of 1268
REJ09B0220-0600
Serial clock
Serial data
TDRE
TEND
TXI interrupt
request generated
Figure 14.17 Example of SCI Transmit Operation
Data written to TDR
and TDRE flag
cleared to 0 in TXI
interrupt handling routine
Bit 7
Transfer direction
Bit 0
1 frame
TXI interrupt
request generated
Bit 7
Bit 0
Bit 1
Bit 6
TEI interrupt
request generated
Bit 7