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Bootloader Features
171
SPRUI07–March 2020
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Boot ROM
Table 2-1. Vector Locations
Vector
Location in
Boot ROM
Contents
(that is, points to) Vector
Location in
Boot ROM
Contents
(that is, points to)
RESET 0x3F FFC0 InitBoot RTOSINT 0x3F FFE0 0x00 0060
INT1 0x3F FFC2 0x00 0042 Reserved 0x3F FFE2 0x00 0062
INT2 0x3F FFC4 0x00 0044 NMI 0x3F FFE4 0x00 0064
INT3 0x3F FFC6 0x00 0046 ILLEGAL 0x3F FFE6 ITRAPIsr
INT4 0x3F FFC8 0x00 0048 USER1 0x3F FFE8 0x00 0068
INT5 0x3F FFCA 0x00 004A USER2 0x3F FFEA 0x00 006A
INT6 0x3F FFCC 0x00 004C USER3 0x3F FFEC 0x00 006C
INT7 0x3F FFCE 0x00 004E USER4 0x3F FFEE 0x00 006E
INT8 0x3F FFD0 0x00 0050 USER5 0x3F FFF0 0x00 0070
INT9 0x3F FFD2 0x00 0052 USER6 0x3F FFF2 0x00 0072
INT10 0x3F FFD4 0x00 0054 USER7 0x3F FFF4 0x00 0074
INT11 0x3F FFD6 0x00 0056 USER8 0x3F FFF6 0x00 0076
INT12 0x3F FFD8 0x00 0058 USER9 0x3F FFF8 0x00 0078
INT13 0x3F FFDA 0x00 005A USER10 0x3F FFFA 0x00 007A
INT14 0x3F FFDC 0x00 005C USER11 0x3F FFFC 0x00 007C
DLOGINT 0x3F FFDE 0x00 005E USER12 0x3F FFFE 0x00 007E
2.2 Bootloader Features
This section describes in detail the boot mode selection process, as well as the specifics of the bootloader
operation.
2.2.1 Bootloader Functional Operation
The bootloader is the program located in the on-chip boot ROM that is executed following a reset.
The bootloader is used to transfer code from an external source into internal memory following power up.
This allows the on-chip flash memory to be programmed via a serial port, for example.
The bootloader provides a variety of different ways to download code to accommodate different system
requirements. The bootloader uses various GPIO signals to determine which boot mode to use. The boot
mode selection process as well as the specifics of each bootloader are described in the remainder of this
document. Figure 2-3 shows the basic bootloader flow.
The reset vector in boot ROM redirects program execution to the InitBoot function. After performing device
initialization the bootloader will check the state of GPIO pins to determine which boot mode you want to
execute. Options include: jump to flash, jump to OTP, jump to SARAM, jump to XINTF, or call one of the
on-chip boot loading routines.
After the selection process and if the required bootloading is complete, the processor will continue
execution at an entry point determined by the boot mode selected. If a bootloader was called, then the
input stream loaded by the peripheral determines this entry address. This data stream is described in
Section 2.2.10. If, instead, you choose to boot directly to Flash, OTP, XINTF or SARAM, the entry address
is predefined for each of these memory blocks.
The following sections discuss in detail the different boot modes available and the process used for
loading data code into the device.
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