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Section 10 Serial Communication Interface
Rev. 6.00 Sep 12, 2006 page 287 of 526
REJ09B0326-0600
10.2.4
Operation in SSB Mode
SSB communication uses two lines, SCL (Serial Clock) and SDA (Serial Data), and enables
multiple ICs to be connected as shown in figure 10.3.
In SSB mode, TAIL MARK is sent after an 8- or 16-bit data transfer. HOLD TAIL or LATCH
TAIL can be selected as TAIL MARK.
H8/3644
Group
SCK
SO
SCL
SDA
1
1
SCL
SDA
IC-A
SCL
SDA
IC-B
SCL
SDA
IC-C
Figure 10.3 Example of SSB Connection
Clock:
The transfer clock can be selected from eight internal clocks or an external clock, but since
the H8/3644 Group uses clock output, an external clock should not be selected. The transfer rate
can be selected by bits CKS2 to CKS0 in SCR1. Since this is also the TAIL MARK transfer rate,
the setting should be made to give a transfer clock cycle of at least 2 µs.
Data Transfer Format:
Figure 10.4 shows the SCI1 transfer format. Data is sent starting from the
least significant bit, in LSB-first format. TAIL MARK is sent after an 8- or 16-bit data transfer.
SCK
1
1
SO
Bit 1
Bit 0
Bit 2
Bit 3
Bit 4
Bit 14
Bit 5
Bit 15
TAIL MARK
1 frame
Figure 10.4 Transfer Format (When SNC1 = 0, SNC0 = 1, MRKON = 1)
Содержание F-ZTAT H8/3642A Series
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Страница 21: ...Rev 6 00 Sep 12 2006 page xix of xx Appendix E Product Code Lineup 522 Appendix F Package Dimensions 524 ...
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Страница 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Страница 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Страница 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
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 ...