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參數(shù)資料
| 型號： | AK4641 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | 16 BIT CODEC WITH BLUETOOTH INTERFACE |
| 中文描述： | 16位編解碼器與藍牙接口 |
| 文件頁數(shù)： | 28/51頁 |
| 文件大小： | 461K |
| 代理商： | AK4641 |
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ASAHI KASEI
[AK4641]
MS0301-E-00
2004/05
- 34 -
(2)-2. READ Operations
Set the R/W bit = “1” for the READ operation of the AK4641. After transmission of data, the master can read the next
address’s data by generating an acknowledge instead of generating a stop condition after the receipt of the first data word.
After receiving each data packet the internal 5-bit address counter is incremented by one, and the next data is
automatically taken into the next address. If the address exceeds 1FH prior to generating a stop condition, the address
counter will “roll over” to 00H and the previous data will be overwritten.
The AK4641 supports two basic read operations: CURRENT ADDRESS READ and RANDOM ADDRESS READ.
(2)-2-1. CURRENT ADDRESS READ
The AK4641 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 receipt of the slave address with R/W bit set to “1”, the AK4641 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 AK4641 ceases transmission.
SDA
Slave
Address
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 36. 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 AK4641 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 AK4641 ceases transmission.
SDA
Slave
Address
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 37. RANDOM ADDRESS READ
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