Users Manual

R01UH0823EJ0110 Rev.1.10 Page 1326 of 1852
Nov 30, 2020
RX23W Group 37. Serial Sound Interface (SSI)
• MSB-First and Left-Justified Format
Figure 37.4
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
Figure 37.5
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)
Table 37.6 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 86420
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