HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 506
HD6412240
Manufacturer Part Number
HD6412240
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412240.pdf
(818 pages)
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Section 12 Serial Communication Interface (SCI)
12.5
The following points should be noted when using the SCI.
Module Stop Mode Setting
SCI operation can be disabled or enabled using the module stop control register. The initial setting
is for SCI operation to be halted. Register access is enabled by clearing module stop mode. For
details, see section 18, Power-Down Modes.
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 12.13. If there is an overrun error, data is not transferred from RSR to RDR, and
the receive data is lost.
Table 12.13 State of SSR Status Flags and Transfer of Receive Data
Legend:
X:
Rev.3.00 Mar. 26, 2007 Page 464 of 772
REJ09B0355-0300
RDRF
1
0
0
1
1
0
1
: Receive data is transferred from RSR to RDR.
Receive data is not transferred from RSR to RDR.
SSR Status Flags
Usage Notes
ORER
1
0
0
1
1
0
1
FER
0
1
0
1
0
1
1
PER
0
0
1
0
1
1
1
Receive Data Transfer
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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