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參數(shù)資料
| 型號： | WM8722 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | Stereo DAC with Integrated Tone Generator and Line/Variable Level Outputs |
| 中文描述： | 立體聲DAC，具有集成的音調(diào)發(fā)生器和線/變平輸出 |
| 文件頁數(shù)： | 12/23頁 |
| 文件大小： | 438K |
| 代理商： | WM8722 |
WM8722
Advanced Information
WOLFSON MICROELECTRONICS LTD
AI Rev 1.5 May 2000
12
MODES OF OPERATION
The software control interface may be operated using either a 3-wire (SPI-compatible) or 2-wire MPU
interface. Selection of interface format is achieved by monitoring the state of BUSY pin at power up.
In 3-wire mode, MD is used for the program data, MC is used to clock in the program data and
LATCH is used to latch in the program data. In 2-wire mode, MD is used for serial data and MC is
used for serial clock. In 2-wire mode, the LATCH pin allows the user to select one of two addresses.
SELECTION OF SERIAL CONTROL MODE
The serial control interface may be selected to operate in either 2 or 3-wire modes. This is achieved
by setting the state of the BUSY pin at power-up with a weak, external pull-up or pull-down resistor
(typically 10k). This pin is an input at power up, and its state selects the type of input format. The
value input at power-up is sampled and stored internally. This allows the BUSY pin to be used as an
output when tone generation has been enabled. This stored value is only reset when the device is
powered off.
BUSY PIN (TONE
GENERATION NOT ENABLED)
0
1
Table 3. Control Interface Mode Selection
INTERFACE
FORMAT
3 wire
2 wire
3-WIRE (SPI COMPATIBLE) SERIAL CONTROL MODE
The WM8722 can be controlled using a 3-wire serial interface. MD is used for the program data, MC
is used to clock in the program data and LATCH is use to latch in the program data. The 3-wire
interface protocol is shown in Figure 7.
LATCH
MC
MD
B15
B6
B7
B8
B9
B10
B11
B12
B13
B14
B1
B2
B3
B4
B5
B0
Figure 7. 3-Wire Serial Interface
2-WIRE SERIAL CONTROL MODE
The WM8722 supports a 2-wire MPU serial interface. The device operates as a slave device only.
The WM8722 has one of two slave addresses that are selected by setting the state of pin 5,
(LATCH).
MD
MC
ACK
R ADDR
R/W
ACK
ACK
ADDR
DATA B7-0
DATA B15-8
STOP
START
Figure 8. 2-Wire Serial Interface
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