HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 328
HD6433640
Manufacturer Part Number
HD6433640
Description
H8/3644 Series Hardware Manual
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6433640.pdf
(508 pages)
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Transmitting: Figure 10.11 shows an example of a flowchart for data transmission. This
procedure should be followed for data transmission after initializing SCI3.
322
Figure 10.11 Example of Data Transmission Flowchart (Asynchronous Mode)
1
2
3
Clear bit TE to 0
Read bit TDRE
Read bit TEND
Write transmit
Continue data
Break output?
transmission?
Set PDR = 0,
data to TDR
TDRE = 1?
TEND = 1?
PCR = 1
in SCR3
in SSR
in SSR
Start
End
Yes
No
Yes
Yes
No
Yes
No
No
1.
2.
3.
Read the serial status register (SSR)
and check that bit TDRE is set to 1,
then write transmit data to the transmit
data register (TDR). When data is
written to TDR, bit TDRE is cleared to 0
automatically.
When continuing data transmission,
be sure to read TDRE = 1 to confirm that
a write can be performed before writing
data to TDR. When data is written to
TDR, bit TDRE is cleared to 0
automatically.
If a break is to be output when data
transmission ends, set the port PCR to 1
and clear the port PDR to 0, then clear bit
TXD in PMR7 and bit TE in SCR3 to 0.
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