Some have +5V and GND, most have GND and GND.Could you measure if that CLK is an really an input ?
I think they are clones. If they are, they put the Saleae brand name on a clone.It seems there is alternative software for it : http://sigrok.org/wiki/ARMFLY_Mini-Logichttp://sigrok.org/wiki/MCU123_Saleae_Logic_clonehttp://sigrok.org/wiki/MCU123_USBee_AX_Pro_cloneCould you open the case, to see if some additions are made for the CLK input ?
Some reviews : http://www.jwandrews.co.uk/2011/12/saleae-logic-analyser-clone-teardown-and-reprogramming/https://unboxnbeyond.wordpress.com/2014/08/31/cheap-logic-analyzer-review-do-they-work/The CLK input on other models can be used for the signal, but also without. In software the internal or external clock can be selected.
Links to devices with a CLK:https://www.squirrel-labs.net/modules/programmers/usb-logic-analyzer-24m-8ch-mcu-arm-fpga-dsp-debug-tool.htmlhttps://www.tokopedia.com/microtech-id/logic-analyzer-8ch-24mhzThe first one tells to go to the saleae download page. The second one shows a screendump of version 1.1.4.
I tried Logic 1.1.15 and 1.2.1, but can't find an external clock option.Can you use it without CLK ?
Try to measure the resistance between CLK to GND and +5V, for example with the device not powered.Try a weak signal of about 2V, via a resistor of 10k when the device is powered. If the signal is 2V before and after the resistor, the input is high impedance and it is an input.It seems that the Saleae software does not have an option for external clock.I suppose it will work without.
This is mine with a CLK pin
A battery of 1.3V via a resistor to CLK causes a voltage drop over the resistor of 1.2V ?Then it is probably a clock output.An input should have no voltage drop over the resistor.
With that in mind I plugged my 'scope into the CLK and low and behold I have small, offset by 0.166v triangular wave of about 4.4kHz peak to peak 0.1v. It doesn't change with sampling frequency.
Hmm. What could I do with that?
It's probably a clock input. The small signal you're seeing could be just the CLK picking up other signals on the PCB.Scroll down on this link to "External Clocks".
The CLKOUT pin, which can be three-stated and inverted usinginternal control bits, outputs the 50% duty cycle 8051 clock, atthe selected 8051 clock frequency: 48 MHz, 24 MHz, or 12 MHz.