Section 10 Serial Communication Interface
Rev. 7.00 Mar 10, 2005 page 384 of 652
REJ09B0042-0700
10.5 Application Notes
The following points should be noted when using SCI3.
1. Relation between writes to TDR and bit TDRE
Bit TDRE in the serial status register (SSR) is a status flag that indicates that data for serial
transmission has not been prepared in TDR. When data is written to TDR, bit TDRE is cleared to
0 automatically. When SCI3 transfers data from TDR to TSR, bit TDRE is set to 1.
Data can be written to TDR irrespective of the state of bit TDRE, but if new data is written to
TDR while bit TDRE is cleared to 0, the data previously stored in TDR will be lost of it has not
yet been transferred to TSR. Accordingly, to ensure that serial transmission is performed
dependably, you should first check that bit TDRE is set to 1, then write the transmit data to TDR
once only (not two or more times).
2. Operation when a number of receive errors occur simultaneously
If a number of receive errors are detected simultaneously, the status flags in SSR will be set to the
states shown in table 10.14. If an overrun error is detected, data transfer from RSR to RDR will
not be performed, and the receive data will be lost.
Table 10.14 SSR Status Flag States and Receive Data Transfer
SSR Status Flags
RDRF
*
OER FER PER
Receive Data Transfer
RSR →
→→
→ RDR
Receive Error Status
1 100X Overrun error
0 010O Framing error
0 001O Parity error
1 110X Overrun error + framing error
1 101X Overrun error + parity error
0 011O Framing error + parity error
1 111X Overrun error + framing error + parity error
O : Receive data is transferred from RSR to RDR.
X : Receive data is not transferred from RSR to RDR.
Note: * Bit RDRF retains its state prior to data reception. However, note that if RDR is read after
an overrun error has occurred in a frame because reading of the receive data in the
previous frame was delayed, RDRF will be cleared to 0.
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