ad9954编程注意事项和寄存器介绍(4)

update signal.

CFR1<12>:正弦/余弦选择位

CFR1<12> = 0（默认）。角度-振幅逻辑转换使用余弦函数。 CFR1<12> = 1。角度-振幅逻辑转换使用正弦函数。 CFR1<12>: Sine/Cosine Select Bit

CFR1<12> = 0 (default). The angle-to-amplitude conversion logic employs a cosine function.

CFR1<12> = 1. The angle-to-amplitude conversion logic employs a sine function.

CFR1<11>:清除频率累加器

FR1<11> = 0（默认）。频率累加器启正常功能。

FR1<11> = 1。频率累加器存储元件被清零并且持续清零直到这位本清零。

CFR1<11>: Clear Frequency Accumulator

CFR1<11> = 0 (default). The frequency accumulator functions as normal.

CFR1<11> = 1. The frequency accumulator memory elements are cleared and held clear until this bit is cleared.

CFR1<10>:清除相位累加器

FR1<10> = 0（默认）。相位累加器启正常功能。

FR1<10> = 1。相位累加器存储元件被清零并且持续清零直到这位本清零。

CFR1<10>: Clear Phase Accumulator

CFR1<10> = 0 (default). The phase accumulator functions as normal.

CFR1<10> = 1. The phase accumulator memory elements are cleared and held clear until this bit is cleared.

CFR1<9>:SDIO 仅输入

CFR1<9> = 0（默认）。SDIO引脚是双向的（2-线按序编写程序模式）。 CFR1<9> = 1。SDIO被设置（3-线按序编写程序模式）。 CFR1<9>: SDIO Input Only

CFR1<9> = 0 (default). The SDIO pin is bidirectional (2-wire serial programming mode).

CFR1<9> = 1. The SDIO is configured (3-wire serial programming mode).

CFR1<8>:LSB优先

CFR1<8> = 0（默认）。MSB优先初始化被激活。 CFR1<8> = 1。LSB优先初始化被激活。 CFR1<8>: LSB First

CFR1<8> = 0 (default). MSB first format is active. CFR1<8> = 1. LSB first format is active.

CFR1<7>:数字低功耗位

CFR1<7> = 0（默认）。所有数字功能和时钟被激活。

CFR1<7> = 1。所有非IO数字功能被暂停，对降低电源有重要意义。 CFR1<7>: Digital Power-Down Bit

CFR1<7> = 0 (default). All digital functions and clocks are active.

CFR1<7> = 1. All non-I/O digital functionality is suspended, lowering the power significantly.

CFR1<6>:比较器低功耗位

CFR1<6> = 0（默认）。比较器操作被激活。 CFR1<6> = 1。比较器被禁用并且进入低功耗状态。 CFR1<6>: Comparator Power-Down Bit

CFR1<6> = 0 (default). The comparator is enabled for operation. CFR1<6> = 1. The comparator is disabled and is in its lowest power dissipation state.

CFR1<5>:DAC低功耗位

CFR1<5> = 0（默认）。DAC操作被允许。

CFR1<5> = 1。DAC被禁用并且进入低功耗状态。 CFR1<5>: DAC Power-Down Bit

CFR1<5> = 0 (default). The DAC is enabled for operation. CFR1<5> = 1. The DAC is disabled and is in its lowest power dissipation state.

CFR1<4>:时钟输入低功耗位

CFR1<4> = 0（默认）。时钟输入电路操作被激活。

CFR1<4> = 1。时钟输入电路被禁止并且器件进入低功耗状态。 CFR1<4>: Clock Input Power-Down Bit

CFR1<4> = 0 (default). The clock input circuitry is enabled for operation.

CFR1<4> = 1. The clock input circuitry is disabled and the device is in its lowest power dissipation state.

CFR1<3>:外部低功耗模式

CFR1<3> = 0（默认）。外部地功耗模式选择是快速恢复低功耗模式。在这种模式下，当PWRDWNCTL输入脚为高时，数字逻辑（电路）和DAC数字逻辑电源关闭。DAC偏置电路，PLL，晶正，和时钟输入电路电源被关闭。CFR<7>决定是否关掉比较器电源。CFR<7>，和CFR<5:4>被忽略。

CFR1<3> = 1。外部低功耗模式被选择是全部进入低功耗模式。在这

种模式下，当PWRDWNCTL输入脚为高时，所有功能掉电。这些包括DAC和PLL，这些需要花费大量的时间加电。CFR1<7:4>全部被忽略。 CFR1<3>: External Power-Down Mode

CFR1<3> = 0 (default). The external power-down mode selected is the rapid recovery power-down mode. In this mode, when the PWRDWNCTL input pin is high, the digital logic and the DAC digital logic are powered down. The DAC bias circuitry, PLL, oscillator, and clock input circuitry are not powered down. CFR1<6> determines whether the comparator is powered down. CFR1<7>, and CFR1<5:4> are ignored.

CFR1<3> = 1. The external power-down mode selected is the full power-down mode. In this mode, when the PWRDWNCTL input pin is high, all functions are powered down. This includes the DAC and PLL, which take a significant amount of time to power up. CFR1<7:4> are all ignored.

CFR1<2>:线性扫描No-Dwell位

如果CFR1<21>被清零，这个位无关紧要（忽略）。

CFR1<21>=0（默认）。线性扫频No-Dwell功能未被激活。如果No-Dwell功能处于未被激活，当扫描完成，扫描不被启动直到IO更新，或者改变断面，按照先前的描述初始化其他扫频。在扫描时输出频率保持在最后的值。