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參數(shù)資料
| 型號： | AK4645EZ |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | Stereo CODEC with MIC/HP-AMP |
| 中文描述： | 立體聲編解碼器麥克風/惠普腺苷 |
| 文件頁數(shù)： | 68/96頁 |
| 文件大?。?/td> | 933K |
| 代理商： | AK4645EZ |
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[AK4645EZ]
MS0605-E-00
2007/06
- 68 -
(2)-2. READ Operations
Set the R/W bit = “1” for the READ operation of the AK4645. After transmission of data, the master can read the next
address’s data by generating an acknowledge instead of terminating the write cycle after receiving the first data word.
After receiving each data packet the internal 6-bit address counter is incremented by one, and the next data is
automatically taken into the next address. If the address exceeds 24H prior to generating a stop condition, the address
counter will “roll over” to 00H and the data of 00H will be read out.
The AK4645 supports two basic read operations: CURRENT ADDRESS READ and RANDOM ADDRESS READ.
(2)-2-1. CURRENT ADDRESS READ
The AK4645 contains an internal address counter that maintains the address of the last word accessed, incremented by
one. Therefore, if the last access (either a read or write) were to address n, the next CURRENT READ operation would
access data from the address n+1. After receiving the slave address with R/W bit set to “1”, the AK4645 generates an
acknowledge, transmits 1-byte of data to the address set by the internal address counter and increments the internal
address counter by 1. If the master does not generate an acknowledge to the data but instead generates a stop condition,
the AK4645 ceases transmission.
SDA
Slave
Address
S
S
T
A
R
T
R/W="1"
A
C
K
A
C
K
Data(n+1)
A
C
K
Data(n+2)
A
C
K
A
C
K
Data(n+x)
A
C
K
P
S
T
O
P
Data(n)
Figure 68. CURRENT ADDRESS READ
(2)-2-2. RANDOM ADDRESS READ
The random read operation allows the master to access any memory location at random. Prior to issuing the slave address
with the R/W bit set to “1”, the master must first perform a “dummy” write operation. The master issues a start request, a
slave address (R/W bit = “0”) and then the register address to read. After the register address is acknowledged, the master
immediately reissues the start request and the slave address with the R/W bit set to “1”. The AK4645 then generates an
acknowledge, 1 byte of data and increments the internal address counter by 1. If the master does not generate an
acknowledge to the data but instead generates a stop condition, the AK4645 ceases transmission.
SDA
Slave
Address
S
S
T
A
R
T
R/W="0"
A
C
K
A
C
K
A
C
K
Data(n)
A
C
K
Data(n+x)
A
C
K
P
S
T
O
P
Sub
Address(n)
S
Slave
Address
R/W="1"
S
T
A
R
T
Data(n+1)
A
C
K
A
C
K
Figure 69. RANDOM ADDRESS READ
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AK4645 | Stereo CODEC with MIC/HP-AMP |
| AK4646EZ | Stereo CODEC with MIC/SPK-AMP |
| AK4646 | Stereo CODEC with MIC/SPK-AMP |
| AK4646EN | Stereo CODEC with MIC/SPK-AMP |
| AK4647 | Stereo CODEC with MIC/HP-AMP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4646 | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with built-in MIC/SPK amplifier |
| AK4646_11 | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/SPK-AMP |
| AK4646EN | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/SPK-AMP |
| AK4646ENP-L | 制造商:Asahi Kasei Microsystems Co Ltd 功能描述:STEREO CODEC+SPK |
| AK4646EZ | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/SPK-AMP |
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