HD6433935 Hitachi, HD6433935 Datasheet - Page 301
HD6433935
Manufacturer Part Number
HD6433935
Description
8-Bit MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6433935.pdf
(521 pages)
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Figure 10-8 shows an example of a flowchart for data transmission. This procedure should be
followed for data transmission after initializing SCI3.
Transmitting
Figure 10-8 Example of Data Transmission Flowchart (Asynchronous Mode)
1
2
3
Sets bits SPC31 and
SPC32 to 1 in SPCR
Clear bit TE to 0
Read bit TDRE
Read bit TEND
Write transmit
Continue data
transmission?
Break output?
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.
(After the TE bit is set to 1, one frame of
1s is output, then transmission is possible.)
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
TE in SCR3 to 0.
289
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