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參數(shù)資料
| 型號： | 1200 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC20 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, QLP-20 |
| 文件頁數(shù)： | 10/70頁 |
| 文件大?。?/td> | 841K |
| 代理商： | 1200 |
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Chipcon
SmartRF CC1100
Chipcon AS
SmartRF
CC1100 Preliminary Data Sheet (rev. 1.0) 2005-04-25
Page 18 of 68
Figure 5: SmartRF
Studio user interface
18 4-wire Serial Configuration and Data Interface
CC1100 is configured via a simple 4-wire SPI-
compatible interface (SI, SO, SCLK and CSn)
where
CC1100 is the slave. This interface is
also used to read and write buffered data. All
address and data transfer on the SPI interface
is done most significant bit first.
All transactions on the SPI interface start with
a header byte containing a read/write bit, a
burst access bit and a 6-bit address.
During address and data transfer, the CSn pin
(Chip Select, active low) must be kept low. If
CSn
goes high during the access, the transfer
will be cancelled.
When CSn goes low, the MCU must wait until
the
CC1100 SO pin goes low before starting to
transfer the header byte. This indicates that
the voltage regulator has stabilized and the
crystal is running. Unless the chip was in the
SLEEP or XOFF states, the SO pin will always
go low immediately after taking CSn low.
18.1
Chip Status Byte
When the header byte is sent on the SPI
interface, the chip status byte is sent by the
CC1100 on the SO pin. The status byte contains
key status signals, useful for the MCU. The
first bit, s7, is the CHIP_RDYn signal; this
signal must go low before the first positive
edge of SCLK. The CHIP_RDYn signal
indicates that the crystal is running and the
regulated digital supply voltage is stable.
Bit 6, 5 and 4 comprises the STATE value. This
value reflects the state of the chip. When idle
the XOSC and power to the digital core is on,
but all other modules are in power down. The
frequency and channel configuration should
only be updated when the chip is in this state.
The RX state will be active when the chip is in
receive mode. Likewise, TX is active when the
chip is transmitting.
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