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Section 10 Serial Communication Interface
Rev. 6.00 Sep 12, 2006 page 332 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 10.23 shows an example of the operation when transmitting using the multiprocessor
format.
1 frame
Start
bit
Start
bit
Transmit
data
Transmit
data
MPB
MPB
Stop
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 10.23 Example of Operation when Transmitting using Multiprocessor Format
(8-Bit Data, Multiprocessor Bit, 1 Stop Bit)
Multiprocessor Receiving:
Figure 10.24 shows an example of a flowchart for multiprocessor data
reception. This procedure should be followed for multiprocessor data reception after initializing
SCI3.
Summary of Contents for F-ZTAT H8/3642A Series
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Page 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Page 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Page 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Page 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Page 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Page 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...