r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 1322

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

25. Audio Codec Interface (HAC)
Rev.1.00 Jan. 10, 2008 Page 1292 of 1658
REJ09B0261-0100
Send_read_request (RegN)
Send_read_request (RegN)
Read_codec_aux (RegN)
Get_codec_data (RegN)
Get_codec_data (RegN)
Figure 25.5 Sample Flowchart for Off-Chip Codec Register Read (1)
RegN = Last_Reg?
Read_codec_aux
Data 2 return
Read codec
Data return
Error
Error
Error
Error
Error
: Data acquisition
: Data 1 acquisition
: Data 2 acquisition
No
No
No
No
No
No
Input: RegN (address of the codec register to be read)
Input: RegN (address of the codec register to be read)
Read_codec_aux (RegV)
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
No
RegV = H'7C
(Vender ID1)
Error
In continuous reading of registers in some off-chip codec
devices, the data in the register previously read may be read
again. In such case, take the steps in this flowchart.
Yes
Dummy processing
(Discard the first data)
Error
Dummy read
Last_Reg: Address of the register
read last time