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Initialize
Start transmitting
Read TDRE flag in SSR
TDRE= 1
Write transmit data in TDR
and set MPBT bit in SSR
Clear TDRE flag to 0
All data transmitted?
Read TEND flag in SSR
TEND= 1
Output break signal?
Clear DR bit to 0 and set DDR to 1
Clear TE bit to 0 in SCR
<End>
Figure 12.10 Sample Flowchart for Transmitting Multiprocessor Serial Data
398
(1)
(2)
No
Yes
No
(3)
Yes
No
Yes
No
(4)
Yes
(1)
SCI initialization:
the transmit data output function of
the TxD pin is selected automatically.
(2)
SCI status check and transmit data
write:
read SSR, check that the TDRE flag is
1, then write transmit data in TDR.
Also set the MPBT flag to 0 or 1 in
SSR. Finally, clear the TDRE flag to 0.
(3)
To continue transmitting serial data:
after checking that the TDRE flag is 1,
indicating that data can be written, write
data in TDR, then clear the TDRE flag
to 0.
(4)
To output a break signal at the end of
serial transmission:
set the DDR bit to 1 and clear the DR
bit to 0, then clear the TE bit to 0 in
SCR.
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