HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 688
HD6412320
Manufacturer Part Number
HD6412320
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412320.pdf
(1302 pages)
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Section 14 Serial Communication Interface (SCI)
14.5
The following points should be noted when using the SCI.
Relation between Writes to TDR and the TDRE Flag: The TDRE flag in SSR is a status flag
that indicates that transmit data has been transferred from TDR to TSR. When the SCI transfers
data from TDR to TSR, the TDRE flag is set to 1.
Data can be written to TDR regardless of the state of the TDRE flag. However, if new data is
written to TDR when the TDRE flag is cleared to 0, the data stored in TDR will be lost since it has
not yet been transferred to TSR. It is therefore essential to check that the TDRE flag is set to 1
before writing transmit data to TDR.
Operation when Multiple Receive Errors Occur Simultaneously: If a number of receive errors
occur at the same time, the state of the status flags in SSR is as shown in table 14.13. If there is an
overrun error, data is not transferred from RSR to RDR, and the receive data is lost.
Table 14.13 State of SSR Status Flags and Transfer of Receive Data
RDRF
1
0
0
1
1
0
1
Notes:
Rev.6.00 Sep. 27, 2007 Page 658 of 1268
REJ09B0220-0600
X : Receive data is not transferred from RSR to RDR.
SSR Status Flags
ORER
1
0
0
1
1
0
1
Usage Notes
: Receive data is transferred from RSR to RDR.
FER
0
1
0
1
0
1
1
0
0
1
1
PER
0
1
1
Receive Data Transfer
from RSR to RDR
X
X
X
X
Receive Error Status
Overrun error
Framing error
Parity error
Overrun error + framing error
Overrun error + parity error
Framing error + parity error
Overrun error + framing error +
parity error
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