Figure 12.16 Sample Flowchart For Serial Transmitting - Hitachi H8/3062 Hardware Manual

• Transmitting Serial Data (Synchronous Mode): Figure 12.16 shows a sample flowchart for
transmitting serial data and indicates the procedure to follow.
Initialize
Start transmitting
Read TDRE flag in SSR
TDRE= 1
Write transmit data in TDR
and clear TDRE flag to 0 in SSR
All data transmitted?
Read TEND flag in SSR
TEND= 1
Clear TE bit to 0 in SCR
<End>

Figure 12.16 Sample Flowchart for Serial Transmitting

(1)
(2)
No
Yes
No
(3)
Yes
No
Yes
SCI initialization: the transmit data
(1)
output function of the TxD pin is
selected automatically.
SCI status check and transmit data
(2)
write: read SSR, check that the TDRE
flag is 1, then write transmit data in
TDR and clear the TDRE flag to 0.
To continue transmitting serial data:
(3)
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.
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