參數(shù)資料
型號(hào)： CS2200-CP-CZZR
廠商： CIRRUS LOGIC INC
元件分類(lèi)： XO, clock
英文描述： PHASE LOCKED LOOP, 75 MHz, PDSO10
封裝： 3 MM, LEAD FREE, MO-187, MSOP-10
文件頁(yè)數(shù)： 8/26頁(yè)
文件大?。?/td> 307K
代理商： CS2200-CP-CZZR
CS2200-CP
16
DS759PP1
6. SPI / IC CONTROL PORT
The control port is used to access the registers and allows the device to be configured for the desired operational
modes and formats. The operation of the control port may be completely asynchronous with respect to device inputs
and outputs. However, to avoid potential interference problems, the control port pins should remain static if no op-
eration is required.
The control port operates with either the SPI or IC interface, with the CS2200 acting as a slave device. SPI Mode
is selected if there is a high-to-low transition on the AD0/CS pin after power-up. IC Mode is selected by connecting
the AD0/CS pin through a resistor to VD or GND, thereby permanently selecting the desired AD0 bit address state.
In both modes the EnDevCfg1 and EnDevCfg2 bits must be set to 1 for normal operation.
WARNING: All “Reserved” registers must maintain their default state to ensure proper functional operation.
6.1
SPI Control
In SPI Mode, CS is the chip select signal; CCLK is the control port bit clock (sourced from a microcontroller),
and CDIN is the input data line from the microcontroller. Data is clocked in on the rising edge of CCLK. The
device only supports write operations.
Figure 10 shows the operation of the control port in SPI Mode. To write to a register, bring CS low. The first
eight bits on CDIN form the chip address and must be 10011110. The next eight bits form the Memory Ad-
dress Pointer (MAP), which is set to the address of the register that is to be updated. The next eight bits are
the data which will be placed into the register designated by the MAP.
There is MAP auto increment capability, enabled by the INCR bit in the MAP register. If INCR is a zero, the
MAP will stay constant for successive read or writes. If INCR is set to a 1, the MAP will automatically incre-
ment after each byte is read or written, allowing block writes of successive registers.
6.2
IC Control
In IC Mode, SDA is a bidirectional data line. Data is clocked into and out of the device by the clock, SCL.
There is no CS pin. The AD0 pin forms the least-significant bit of the chip address and should be connected
to VD or GND as appropriate. The state of the AD0 pin should be maintained throughout operation of the
device.
The signal timings for a read and write cycle are shown in Figure 11 and Figure 12. A Start condition is de-
fined as a falling transition of SDA while the clock is high. A Stop condition is a rising transition while the
clock is high. All other transitions of SDA occur while the clock is low. The first byte sent to the CS2200 after
a Start condition consists of the 7-bit chip address field and a R/W bit (high for a read, low for a write). The
upper 6 bits of the 7-bit address field are fixed at 100111 followed by the logic state of the AD0 pin. The
Referenced Control
Register Location
4
5
6
7
CCLK
CHIP ADDRESS
MAP BYTE
DATA
1
0
1
0
CDIN
INCR
6
5
4
3
2
1
0
7
6
1
0
1
2
3
8
9
12
16 17
10 11
13 14 15
DATA +n
CS
7
6
1
0
Figure 10. Control Port Timing in SPI Mode
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