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Rev. 5.00, 09/03, page 483 of 760
Start of transmission/reception
Read TDRE bit in SCSSR
All data
transmitted/received?
End of transmission/reception
(1)
No
Yes
TDRE = 1?
Write transmit data to SCTDR
and clear TDRE bit in SCSSR to 0
RDRF = 1?
No
Yes
Yes
No
Read ORER bit in SCSSR
Error processing
(2)
ORER = 1?
No
Read RDRF bit in SCSSR
(4)
Yes
(3)
Read receive data from SCRDR
and clear RDRF bit in SCSSR to 0
Clear TE and RE bits
in SCSCR to 0
Notes: 1.
2.
Numbers in parentheses refer to steps in the preceding procedure description.
In switching from transmitting or receiving to simultaneous transmitting
and receiving, clear both TE and RE to 0, then set both TE and RE to 1 simultaneously.
Figure 14.23 Sample Flowchart for Transmitting/Receiving Serial Data