SH7760 Datasheet, PDF (749/1345 Pages) Renesas Technology Corp – SuperHTM RISC engine

3. Matsushita Format
SCKP = 0, SWSP = 0, DEL = 1, CHNL = 00, SPDP = 0, SDTA = 1
System word length > data word length
SSI_SCK
SSI_WS
SSI_SDATA ^Prev.
MSB
LSB
Padding
Data word 1
System word 1
MSB
LSB
Padding
Data word 2
System word 2
Figure 20.5 Matsushita Format (with Padding Bits First, Followed by Serial Data)
(6) Multi-Channel Formats
Some devices extend the definition of the specification by Philips and allow more than 2
channels to be transferred within two system words.
The SSI module supports the transfer of 4, 6 and 8 channels by the use of the CHNL, SWL and
DWL bits. It is important that the system word length (SWL) is greater than or equal to the
number of channels (CHNL) times the data word length (DWL).
Table 20.4 shows the number of padding bits for each of the valid configurations. If a setup is not
valid it does not have a number in the following table and has instead a dash.
Rev. 1.0, 02/03, page 699 of 1294