Renesas SH7781 - Manual (Page 1321)

25. Audio Codec Interface (HAC)
Rev.1.00 Jan. 10, 2008 Page 1291 of 1658
REJ09B0261-0100
No
No
Yes
Yes
Yes
Write to codec
Return Error
Write 0 to TSR.CMDAMT
Write 0 to TSR.CMDDMT
Prerequisite:
ACR.TX12_ATOMIC = 1
Wait for 1 μs
LoopCnt++
Clear RetryCnt to 0
Set data in CSDR
Set Addr. in CSAR
No
Clear LoopCnt to 0
RetryCnt++
TSR.CMDAMT = 1 &
TSR.CMDDMT = 1
E1 < LoopCnt 1
5 < RetryCnt
Notes: E1: Loop count required in the target system
(21 < E1 < 1000)
Input: Addr: Address of codec register to be written to
Data: Data to be written to codec register
RetryCnt: Software counter for error detection
LoopCnt: Software counter for wait insertion
Figure 25.4 Sample Flowchart for Off-Chip Codec Register Write