HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 500

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 12 Serial Communication Interface (SCI)
Serial data reception (clocked synchronous mode): Figure 12.18 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 clocked 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.3.00 Mar. 26, 2007 Page 458 of 772
REJ09B0355-0300
Serial clock
Serial data
TDRE
TEND
TXI interrupt
request generated
Figure 12.17 Example of SCI Operation in Transmission
interrupt service routine
Data written to TDR
cleared to 0 in TXI
Bit 0
and TDRE flag
Transfer direction
Bit 1
1 frame
TXI interrupt
request generated
Bit 7
Bit 0
Bit 1
Bit 6
TEI interrupt
request generated
Bit 7