Users Manual

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R01UH0823EJ0110 Rev.1.10 Page 1327 of 1852
Nov 30, 2020
RX23W Group 37. Serial Sound Interface (SSI)
(8) Operating Settings Other than Word Length Related Settings
Several more configuration bits in non-compressed mode are shown below. These bits are not mutually exclusive, but
some combinations may not be useful.
These configuration bits are described below with reference to the basic format sample in
Figure 37.6.
In
Figure 37.6 to Figure 37.14, a system word length of 6 bits and a data word length of 4 bits are used for
simplification of these figures.
Figure 37.6 Basic Format Sample (Transmit Mode)
Inverted Clock
Figure 37.7 Inverted Clock
TDn
TD28 TD31
SSISCK
SSIWS
SSIDATA
0
1
Arrow head indicates sampling point of receiver
n bit in transmit data
Means a low level on the serial bus (padding or mute)
Means a high level on the serial bus (padding)
Key for this and following diagrams:
SSICR.SWL[2:0] bits = 6 bits (This is a bit length for description only and cannot be set for actual applications.)
SSICR.DWL[2:0] bits = 4 bits (This is a bit length for description only and cannot be set for actual applications.)
SSICR.CHNL[1:0] bits = 00b, SSICR.SCKP bit = 0, SSICR.SWSP bit = 0, SSICR.SPDP bit = 0, SSICR.SDTA bit = 0,
SSICR.PDTA bit = 0, SSICR. DEL bit = 0, SSICR.MUEN bit = 0
System word 1 System word 2
00
TD31 TD30 TD29 TD28 0 0 TD31 TD30 TD29 TD28 0 0
TD28 TD31
Same as basic format sample configuration except SSICR.SCKP bit = 1
SSISCK
SSIWS
SSIDATA
System word 1 System word 2
00
TD31 TD30 TD29 TD28 0 0 TD31 TD30 TD29 TD28 0 0