HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 430

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 13 Serial Communication Interface (SCI)
In receiving, the SCI operates as follows:
1. The SCI synchronizes with serial clock input or output and initializes internally.
2. Receive data is shifted into RSR in order from the LSB to the MSB. After receiving the data,
Rev. 7.00 Jan 31, 2006 page 404 of 658
REJ09B0272-0700
the SCI checks that RDRF is 0 so that receive data can be loaded from RSR into RDR. If this
check passes, the SCI sets RDRF to 1 and stores the received data in RDR. If the check does
ORER
RDRF
Serial
Serial
clock
data
RXI request
Receive direction
Figure 13.18 Sample Flowchart for Serial Receiving (cont)
Bit 7
Figure 13.19 Example of SCI Receive Operation
and clears RDRF to 0
RXI interrupt handler
Bit 0
reads data in RDR
No
1 frame
Clear ORER bit in SSR to 0
Overrun error handling
Bit 7
Error handling
ORER = 1?
End
RXI request
Bit 0
Yes
Bit 1
Bit 6
error, ERI
Overrun
request
Bit 7