SH7760 Datasheet, PDF (747/1345 Pages) Renesas Technology Corp – SuperHTM RISC engine

(2) Slave Transmitter
This mode allows the SSI module to transmit serial data to another device. The clock and word
select signals used for the serial data stream are also supplied from an external device. If these
signals do not conform to the format as specified in the SSI module then operation is not
guaranteed.
(3) Master Receiver
This mode allows the SSI module to receive serial data from another device. The clock and
word select signals are internally derived from the HAC_BIT_CLK input clock. The format of
these signals is as defined in the SSI module. If the incoming data does not conform to the
defined format then operation is not guaranteed.
(4) Master Transmitter
This mode allows the SSI module to transmit serial data to another device. The clock and word
select signals are internally derived from the HAC_BIT_CLK input clock. The format of these
signals is as defined in the configuration bits in the SSI module.
(5) Configuration Fields - Word Length Related
All configuration bits relating to the word length of SSICR are valid in non-compressed
modes.
There are many configurations that the SSI module can support and it is not sensible to show
all of the Serial Data formats in this document. Some of the combinations are shown below for
the popular formats by Philips, Sony, and Matsushita.
1. Philips Format
Figures 20.2 and 20.3 show the supported Philips protocol both with padding and without.
Padding occurs when the data word length is smaller than the system word length.
SCKP = 0, SWSP = 0, DEL = 0, CHNL = 00
System word length = data word length
SSI_SCK
SSI_WS
SSI_SDATA
prev. sample MSB
LSB
+1
LSB
MSB
LSB
+1
LSB
next sample
System word 1 =
data word 1
System word 2 =
data word 2
Figure 20.2 Philips Format (with no Padding)
Rev. 1.0, 02/03, page 697 of 1294