Firmware User Manual (AE-step)
9
Revision 1.02
2019-04-24
TLE984x Firmware User Manual
BootROM Startup procedure
3
BootROM Startup procedure
This chapter describes the BootROM startup procedure in TLE984x.
The startup procedure is the first software-controlled operation in the BootROM that is automatically
executed after every reset.
There are 2 operation modes in the BootROM :
• User/BSL mode
• Debug Support mode
The operation modes get selected dependent on the latch values of two (2) pins upon reset. Details are
provided in
.
For each HW module a HW abstaction layer (HAL) is implemented with its associated module specific firmware
functions called by the BootROM startup procedure.
gives an overview by showing the startup code partitioning into firmware modules and the
corresponding dataflow.
Figure 3-1 Startup Procedure Architecture Overview
The startup code performs different device initialization steps.
After initialization, the BootROM either starts BSL communication (according to configuration) or jumps to
user mode code execution.
For user mode, BootROM will execute the startup procedure, redirect the vector table to the beginning of the
NVM in user accessible space (by proper setting of the VTOR register) and jump to the customer defined reset
handler routine (jump to the address pointed by the address 11000004
H
) to execute the user program.
3.1
Startup Program Structure
The first task executed by the BootROM startup procedure is to check the reset type.
The BootROM also reads the logical state of certain external Pins (see
) to decide
which initialization sub modules to be executed or to be skipped during the startup sequence.
SWD Debug
Mode
STARTUP_ARCHITECTURE_UM
.
Libraries
(used by all
modules)
MBIST
NVM /
CS
NVM HAL
RAM
Timer
Watchdog
Clock / PLL
Analog Module
Trimming
Clock / PLL
HAL
Analog Module
HAL
