About MCU XE167FM and refered to Users Manual XE167xM:

We need to use the pin P2.9 as address line 22 for external flash memory, at the moment were using default setting for JTAG so weve this configuration:

Startup configuration (Users Manual capitolo 12.3.2):
Startup Mode - Internal Start From Flash
Debug Interface from Flash
STSTAT.HWCFG Value 0x07
P10[6:0] = X X X X 1 1 1

JTAG configuration:
P2.9 TCK
P5.4 TMS
P7.0 TDO
P5.2 TDI

We need to preserve every JTAG functionality (Programming, degub, etc), so we want to swap the P2.9 (used as TCK) with the P8.5, and obtain:

JTAG configuration:
P8.5 TCK
P5.4 TMS
P7.0 TDO
P5.2 TDI

(Users Manual CAP 12-3) We noticed that theres a register called DBGPRR that define the JTAG pin configuration.
The questioni is: How we can change in a definitive way this register with the configuration that we need? We tried to find a way from memtool but nothing, same by setup it from firmware.
Thanks everyone.