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Section 18 Serial Sound Interface
Page 920 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
(6) Master Transceiver
This mode allows serial data transmission and reception between this module and another device.
The clock and word select signals are internally derived from the oversampling clock. The format
of these signals is defined in the configuration fields of this module.
(7) Operating Setting Related to Word Length
All bits related to the SSICR's word length are valid in non-compressed modes. There are many
configurations this module supports, but the formats described below are I
2
S compatible, MSB-
first left-aligned, and MSB-first right-aligned.
I
2
S Compatible Format
Figures 18.3 and 18.4 demonstrate the supported I
2
S compatible format both without and with
padding. Padding occurs when the data word length is smaller than the system word length.
prev. sample
MSB
LSB
+ 1
LSB MSB
LSB
+ 1
LSB
next sample
System word 1 =
data word 1
System word 2 =
data word 2
SSISCK
SSIWS
SSIDATA
SCKP = 0, SWSP = 0, DEL = 0, CHNL = 00
System word length = data word length
Figure 18.3 I
2
S Compatible Format (without Padding)
MSB LSB MSB LSB
Next
System word 1 System word 2
Data word 1 Data word 2Padding Padding
SSISCK
SSIWS
SSIDATA
SCKP = 0, SWSP = 0, DEL = 0, CHNL = 00, SPDP = 0, SDTA = 0
System word length > data word length
Figure 18.4 I
2
S Compatible Format (with Padding)