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Section 10 Serial Communication Interface
Rev. 6.00 Sep 12, 2006 page 318 of 526
REJ09B0326-0600
SCI3 operates as follows when transmitting data.
SCI3 monitors bit TDRE in SSR, and when it is cleared to 0, recognizes that data has been written
to TDR and transfers data from TDR to TSR. It then sets bit TDRE to 1 and starts transmitting. If
bit TIE in SCR3 is set to 1 at this time, a TXI request is made.
Serial data is transmitted from the TXD pin using the relevant data transfer format in table 10.14.
When the stop bit is sent, SCI3 checks bit TDRE. If bit TDRE is cleared to 0, SCI3 transfers data
from TDR to TSR, and when the stop bit has been sent, starts transmission of the next frame. If bit
TDRE is set to 1, bit TEND in SSR is set to 1, and the mark state, in which 1s are transmitted, is
established after the stop bit has been sent. If bit TEIE in SCR3 is set to 1 at this time, a TEI
request is made.
Figure 10.12 shows an example of the operation when transmitting in asynchronous mode.
1 frame
Start
bit
Start
bit
Transmit
data
Transmit
data
Parity
bit
Stop
bit
Parity
bit
Stop
bit
Mark
state
1 frame
0
1
D0
D1
D7
0/1
1
1
1
0
D0
D1
D7
0/1
Serial
data
TDRE
TEND
LSI
operation
TXI request
TDRE
cleared to 0
User
processing
Data written
to TDR
TXI request
TEI request
Figure 10.12 Example of Operation when Transmitting in Asynchronous Mode
(8-Bit Data, Parity, 1 Stop Bit)
Содержание F-ZTAT H8/3642A Series
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Страница 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Страница 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Страница 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...