PIC18F45K50可反转PWM

你好！我刚配置了CCP模块用于PWM模式，并且注意到输出信号可以被反转，但是数据表中没有任何指示。数据表指示CCPXCON寄存器的较低4位应该是B’11xx’用于PWM模式。现在，当这些低4位被替换为B’1100’PWM输出信号是正确的，但是当用B’1111’代替时，输出信号被反转。有人以前遇到过这个问题吗？数据表并没有指明这一点，也没有标示。下面是我使用的汇编代码，配置为正常（非反转）操作，25%占空比和5kHz的PWM频率。另外，我从示波器中包含了两个屏幕截图。



      以下为原文

    Hello!

I just configured the CCP Module for PWM mode, and noticed that the output signal could be inverted, however nothing was indicated in the datasheet.

The datasheet indicates that the lower 4 bits of the CCPxCON register should be b'11xx' for PWM mode.

Now when these lower 4 bits are replaced with the b'1100' the PWM output signal is correct, but when they are replaced with b'1111' the output signal is inverted.

Has anyone met this issue before? The datasheet didn't indicate anything about this, nor did the errata.

Below is the assembly code i used, configured for normal (non-inverted) operation, 25% duty cycle and PWM frequency of 5KHz.

Additionally I included two screen shots from my oscilloscope.
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asm_code.txt (1.09 KB) - downloaded 72 times