HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 405

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

In receiving, the SCI operates as follows:
• The SCI monitors the communication line. When it detects a start bit (0 bit), the SCI
• Receive data is stored in RSR in order from LSB to MSB.
• The parity bit and stop bit are received.
• When the RDRF flag is set to 1, if the RIE bit is set to 1 in SCR, a receive-data-full interrupt
Table 12.11 Receive Error Conditions
Receive Error Abbreviation Condition
Overrun error ORER
Framing error FER
Parity error
synchronizes internally and starts receiving.
After receiving these bits, the SCI carries out the following checks:
⎯ Parity check: The number of 1s in the receive data must match the even or odd parity
⎯ Stop bit check: The stop bit value must be 1. If there are two stop bits, only the first is
⎯ Status check: The RDRF flag must be 0, indicating that the receive data can be transferred
If these all checks pass, the RDRF flag is set to 1 and the received data is stored in RDR. If one
of the checks fails (receive error*), the SCI operates as shown in table 12.11.
Note:
(RXI) is requested. If the ORER, PER, or FER flag is set to 1 and the RIE bit in SCR is also
set to 1, a receive-error interrupt (ERI) is requested.
setting of in the O/E bit in SMR.
checked.
from RSR into RDR.
* When a receive error occurs, further receiving is disabled. In receiving, the RDRF
PER
flag is not set to 1. Be sure to clear the error flags to 0.
Receiving of next data ends while
RDRF flag is still set to 1 in SSR
Stop bit is 0
Parity of received data differs from
even/odd parity setting in SMR
Rev.4.00 Aug. 20, 2007 Page 361 of 638
12. Serial Communication Interface
Data Transfer
Receive data is not transferred
from RSR to RDR
Receive data is transferred from
RSR to RDR
Receive data is transferred from
RSR to RDR
REJ09B0395-0400