some troubles with SiLabs c8051f041

This is a very, very, very fast blink:

while (1) {
    P0 |=(1<<7);      //LED ON
    P0 &= ~(1<<7);  //LED OFF
}

How do you expect to see the LED blink when it is blinking many, many, many times faster than the human eye can see?

You either need to use an oscilloscope to look at that processor pin, or you need to introduce a delay between on->off and between off->on.

A pin that quickly toggles between GND and VCC will look like VCC/2 when you measure with a slow multimeter.

Another thing to remember is that your processor is rather unique and supports single-bit writes to the processor port pins - you can create a one-bit variable mapped to the LED pin and then just assign the value 0 or 1 instead of doing the |= and &= assigns.

This is a very, very, very fast blink:

while (1) {
    P0 |=(1<<7);      //LED ON
    P0 &= ~(1<<7);  //LED OFF
}

How do you expect to see the LED blink when it is blinking many, many, many times faster than the human eye can see?

You either need to use an oscilloscope to look at that processor pin, or you need to introduce a delay between on->off and between off->on.

A pin that quickly toggles between GND and VCC will look like VCC/2 when you measure with a slow multimeter.

Another thing to remember is that your processor is rather unique and supports single-bit writes to the processor port pins - you can create a one-bit variable mapped to the LED pin and then just assign the value 0 or 1 instead of doing the |= and &= assigns.

I use an oscilloscope to see the meandr vaiwform on pin, but see the half of Vdd.
I was try single bit operation:

 sbit LED=P0^7;

.
and then in main:

LED=1;
for(i=0;i!=0xff;++i);
LED=0;
Result - NOTHING.

.
I worry about no SISCLK on pin, were it must to be. Why it happing?

Another common reason for seeing an I/O pin having a voltage somewhere in the middle is when it's an input, or tristated output, without any pull-up/pull-down to hold it properly to VCC or GND.

That would happen if your initialization fails to set it as an output, or if the processor fails to run any program at all.

Why " the processor fails to run any program at all"? What's reason of it? My initialisation is wrong or chip is damange? I was try it on three chips, not only one. I want to see at least out of SYSCLK on pin where is he must to be. Becous it confirm the SYSCLK running.

I do not see you enabling the crossbar, any bit in the xbr registers is irrelevant till you enable the crossbar (xbr2.6 / BBARE)

Erik

I forgot write it. On this notebook I have not Keil IDE fnd I wrote what I remember. Of course, I enable the crossbar at the end of initialisation of ports.

 XBR2 = 0x40;

.

I wrote what I remember.
numerous hhreads have gone waaay astray because someone "wrote something" instead of copying actual code. Please refrain from doing so

Erik

I'm sorry. I tried to test the controllers in the workplace and after the failure at the weekend decided to ask for help. This does not excuse my confusion, but I would like to solve this problem by Monday, but the code remains at the working computer.