r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 1349

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

In the case of the SSI module configured as a transmitter then each word that is written to SSITDR
is transmitted in order on the serial audio bus.
In the case of the SSI module configured as a receiver each word received on the serial audio bus
is presented for reading in order by SSIRDR.
Figures 26.6 to 26.8 show how 4, 6 and 8 channels are transferred on the serial audio bus.
Note that there are no padding bits in the first example, serial data is transmitted/received first and
followed by padding bits in the second example, and padding bits are transmitted/received first
and followed by serial data in the third example. This selection is purely arbitrary.
SSI_SCK
SSI_WS
SSI_SDATA
SSI_SCK
SSI_WS
SSI_SDATA
SCKP = 0, SWSP = 0, DEL = 1, CHNL = 10, SPDP = 1, SDTA = 0
System word length = data word length × 3
SCKP = 0, SWSP = 0, DEL = 1, CHNL = 01, SPDP = don't care, SDTA = don't care
System word length = data word length × 2
Figure 26.7 Multi-channel Format (6 Channels with High Padding)
MSB
Figure 26.6 Multi-channel Format (4 Channels, No Padding)
LSB
word 1
MSB
Data
word 1
Data
System word 1
LSB MSB
LSB MSB
System word 1
word 2
Data
word 2
Data
LSB MSB
LSB MSB
word 3
Data
System word 2
word 3
Data
LSB MSB
word 4
Data
LSB
LSB MSB
MSB
word 1
Data
word 4
System word 1
Data
Rev.1.00 Jan. 10, 2008 Page 1319 of 1658
LSB MSB
26. Serial Sound Interface (SSI) Module
LSB MSB
word 2
Data
System word 2
word 5
LSB MSB
Data
word 3
LSB MSB
Data
System word 2
LSB MSB
word 6
Data
REJ09B0261-0100
word 4
Data
LSB
LSB
MSB
MSB