R01UH0823EJ0100 Rev.1.00
Page 1318 of 1823
Jul 31, 2019
RX23W Group
37. Serial Sound Interface (SSI)
MSB-First and Left-Justified Format
shows the MSB-first and left-justified format with padding.
Figure 37.4
MSB-First and Left-Justified Format
(Transmitted and Received in the Order of Serial Data and Padding Bits)
MSB-First and Right-Justified Format
shows the MSB-first and right-justified format with padding.
Figure 37.5
MSB-First and Right-Justified Format
(Transmitted and Received in the Order of Padding Bits and Serial Data)
shows the number of padding bits for each of the valid setting.
Table 37.6
Number of Padding Bits per System Word for Each Valid Setting
SSICR.CHNL[1:0] Bits
(Decoded Channels per
System Word)
SSICR.SWL[2:0] Bits
(System Word Length)
SSICR.DWL[2:0] Bits (Data Word Length)
000b
001b
010b
011b
100b
101b
8 bits
16 bits
18 bits
20 bits
22 bits
24 bits
00b
1 channel
000b
8 bits
0
—
—
—
—
—
001b
16 bits
8
0
—
—
—
—
010b
24 bits
16
8
6
4
2
0
011b
32 bits
24
16
14
12
10
8
Next
SSICR.SCKP bit = 0, SSICR.SWSP bit = 1, SSICR.DEL bit = 1, SSICR.CHNL[1:0] bits = 00b,
SSICR.SPDP bit = 0, SSICR.SDTA bit = 0
System word length > data word length
SSISCK
SSIWS
SSIDATA
MSB
LSB
MSB
LSB
System word 1
Data word 1
System word 2
Padding
Data word 2
Padding
Prev.
SSICR.SCKP bit = 0, SSICR.SWSP bit = 1, SSICR.DEL bit = 1, SSICR.CHNL[1:0] bits = 00b,
SSICR.SPDP bit = 0, SSICR.SDTA bit = 1
System word length > data word length
SSISCK
SSIWS
SSIDATA
MSB
LSB
MSB
LSB
System word 1
Padding
System word 2
Data word 1
Padding
Data word 2