Install JTAG Tool 4.25 : 4 Steps - Duration: 4:36.45.
Download the Tool 4.25 :
Check the tool version.
Open the binary.
Click on "JTAG Tool.exe"
Select "Debug | Open | Select JTAG Interface"
Press the green button.
A:
Okay, first of all, good job! :)
In a nutshell, there are two types of pins on the JTAG interface, those with pullups enabled and those with pulldowns enabled. You're accessing the data line between the chip and the JTAG interface, which does not have a pullup on it, but you do need a pulldown from either the chip or the software side to allow the interface to pull the data line low. Basically, there are two separate areas where your software can set the pulldowns to pull the data line low:
The JTAG pin defined in the CHIP selector
The JTAG pin defined in the JTAG configuration register
The pin chosen in the CHIP selector is basically an arbitrary value, and the pin defined in the JTAG configuration register is a predetermined value. What the tool does is pick the pin from the JTAG configuration register, and then it replicates that configuration for all other JTAG interfaces. This is why you may see a range of "valid" values.
The example value you see in the tool may appear to be something else, since you're looking at the JTAG configuration register and not the CHIP selector. What you're seeing is really the "default" configuration register, which is the one that the tool chooses when you don't change the CHIP selector. The valid values in the default configuration register are 0xC7, 0x07, and 0x47, which corresponds to the 0xC7, 0x07, and 0x57 on the CHIP selector.
If you examine the CHIP selector in an Arduino IDE configurable-JTAG-interface screenshot, you'll see that the value you're looking at in the JTAG configuration register is 0x07. So, in order to get the correct values, you need to choose the correct configuration register to set the pulldowns to pull the data line low.
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Description: JTAG (Joint Test Action Group) is an electrical specification for the on-chip testability and diagnostics of integrated circuits. It was created by the Joint Test Action Group (JTAG) IEEE Working Group 11, whose members include among others Eric M. Burghardt and Frank Fenstermacher. It is defined in a set of IEEE standard documents, including the IEEE 1149.1 and IEEE 1149.4 standards.
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