Renesas SH7781 - Manual (Page 1323)

25. Audio Codec Interface (HAC)
Rev.1.00 Jan. 10, 2008 Page 1293 of 1658
REJ09B0261-0100
No
Yes
Send_read_request
Write 0 to RSR.STARY
Write 0 to RSR.STDRY
Notes: E2: Loop count required in the target system (13 < E2)
LoopCnt2: Software counter for wait insertion
Addr: Variable to hold CSAR read value.
DataT: Variable to hold CSDR read value.
Set RegN in CSAR
WaitLoop_CMDAMT
Error
Error
Error
Error
Error Return
Wait for 5 μs
LoopCnt 2 ++
No
No
Yes
Yes
No
Yes
Get_codec_data Input: RegN (address of the codec register to be read)
Input: RegN (address of the codec register to be read)
Clear LoopCnt 2 to 0
WaitLoop_RSR
Assign HACCSAR read value to Addr
Addr (R) = RegN?
E2 < LoopCnt 2
Assign HACCSDR read value to Data T
Data T is returned
Figure 25.6 Sample Flowchart for Off-Chip Codec Register Read (2)