View source for STR91x

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This article describes device specifics of the ST STR91x series devices.

== JTAG settings == 
These  device  are  ARM966E-S  based.  We  recommend  to  use  adaptive  clocking  for these devices.
== Unlocking ==
The devices have 3 TAP controllers built-in. When starting  J-Link.exe , it reports 3 JTAG devices. A special tool, J-Link STR9 Commander ( JLinkSTR91x.exe ) is available to directly access the flash controller of the device. This tool can be used to erase the flash  of  the  controller  even  if  a  program  is  in  flash  which  causes  the  ARM  core  to stall. For more information about the J-Link STR9 Commander, please refer to the J-Link User Manual (UM08001).
When  starting  the  STR91x  commander,  a  command  sequence  will  be  performed which brings MCU into Turbo Mode. "While enabling the Turbo Mode, a dedicated test mode signal is set and controls the GPIOs in output. The IOs are maintained in this state until a next JTAG instruction is sent." (ST Microelectronics) Enabling Turbo Mode is necessary to guarantee proper function of all commands in the STR91x Commander.
== Switching the boot bank ==
The bootbank of the STR91x devices can be switched by using the J-Link STR9 Commander which is part of the J-Link software and documentation package. For more information about the J-Link STR9 Commander, please refer to the J-Link User Manual (UM08001).