14-pin 2.54mm JTAG Converter
|
If your target features 14-pin 2.54mm pitch JTAG target debug connector, use 14-pin 2.54 mm JTAG Converter which acts as a pinout converter. It must be ordered separately. The converter is used only in conjunction with solutions supporting MPC5xxx/SPC5 Aurora trace interface (e.g. MPC5x/SPC5x Aurora Active Probe).
The following pinout is valid on the target side:
Signal Direction |
Signal Description |
Signal |
Pin |
Pin |
Signal |
Signal Description |
Signal Direction |
|---|---|---|---|---|---|---|---|
O |
JTAG |
TDI |
1 |
2 |
GND |
Ground |
|
I |
JTAG |
TDO |
3 |
4 |
GND |
Ground |
|
O |
JTAG |
TCK |
5 |
6 |
GND |
Ground |
|
O (not used) |
Nexus Event Input |
EVTI(EVTI0) |
7 |
8 |
nPORESET |
Power On Reset |
O |
IO |
Reset |
nRESET |
9 |
10 |
TMS |
JTAG |
O |
I |
Reference Voltage |
Vref |
11 |
12 |
GND |
Ground |
|
|
Not Connected |
NC |
13 |
14 |
nJCOMP |
JTAG TRST (optional) |
O |
14-pin 2.54mm MPC5xxx/SPC5 pinout
Signal Direction is described from the BlueBox perspective.
Mandatory pins on the microcontroller side are GND, VDD, RESET, TMS, TDI, TDO and TCK.
The JCOMP is an optional pin. Some microcontrollers don’t have this pin. Internally, this is actually the JTAG TRST, which resets the JTAG TAP state machine. Because the JTAG TAP state machine can be reset also by the TMS and the TCK, this pin is optional also for the debugger. If the microcontroller has the JCOMP pin but it is not connected to the target debug connector, it must be set to the non-active state in the target via a pull-up resistor. If not, then the JTAG TAP state machine remains in reset and debugging is not possible.
