H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 614
H8S-2350
Manufacturer Part Number
H8S-2350
Description
16-Bit Single-Chip Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.H8S-2350.pdf
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Section 13 Serial Communication Interface (SCI)
Serial data transmission (asynchronous mode): Figure 13.5 shows a sample flowchart for serial
transmission.
The following procedure should be used for serial data transmission.
Rev. 3.00 Sep 15, 2006 page 580 of 988
REJ09B0330-0300
and clear TDRE flag in SSR to 0
Write transmit data to TDR
Read TDRE flag in SSR
Read TEND flag in SSR
Clear TE bit in SCR to 0
All data transmitted?
Start transmission
Clear DR to 0 and
Break output?
set DDR to 1
Initialization
TDRE = 1
TEND = 1
Figure 13.5 Sample Serial Transmission Flowchart
<End>
Yes
Yes
Yes
Yes
No
No
No
No
[1]
[2]
[3]
[4]
[1] SCI initialization:
[2] SCI status check and transmit data
[3] Serial transmission continuation
[4] Break output at the end of serial
The TxD pin is automatically
designated as the transmit data
output pin.
After the TE bit is set to 1, a frame
of 1s is output, and transmission is
enabled.
write:
Read SSR and check that the
TDRE flag is set to 1, then write
transmit data to TDR and clear the
TDRE flag to 0.
procedure:
To continue serial transmission,
read 1 from the TDRE flag to
confirm that writing is possible,
then write data to TDR, and then
clear the TDRE flag to 0. Checking
and clearing of the TDRE flag is
automatic when the DMAC or DTC
is activated by a transmit data
empty interrupt (TXI) request, and
data is written to TDR.
transmission:
To output a break in serial
transmission, set DDR for the port
corresponding to the TxD pin to 1,
clear DR to 0, then clear the TE bit
in SCR to 0.
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