8
32166A–AVR32806–06/11
Atmel AVR32806
for the default preprogrammed value of this configuration word.
6.2.2.2 Flash user page configuration words preprogrammed values
The default value of the boot loader flash user page Configuration Word1 is E11EFFD7h (that is,
ISP_FORCE is enabled) for all Atmel AVR UC3 C and D series devices.
The default value of the boot loader flash user page Configuration Word2 is:
•
929E0E62h for the AVR UC3 C0-1 series,
•
929E7504h for the AVR UC3 C2 series,
•
That is, the ISP will be activated when
•
the PB0 button onthe UC3C-EK kit is pressed at reset,
•
the HBUTTON0 button on the UC3-C2-Xplained kit is pressed at reset,
•
Refer to
for a description of how to customize and program the two configuration
words.
Table 6-2.
Boot loader flash user page Configuration Word2.
Config
Word2 @
808001F8h
Name
Description
7:0
ISP_CRC8_2
CRC8 of the boot loader user page Configuration
Word2 usingthe polynomial:
P(X) = X
8
+X
2
+X+1.
This CRC is used to check the validity of
Configuration Word2.
15:8
ISP_IO_COND_PIN
The GPIO pin number to test during the boot
process to know whehterto start the USB DFU ISP
or the application. For example, to select PB10 (that
is, QFP144 pin 16 and GPIO pin 42) on the
, this bit field must be set to 42.
Possible values are:
- 0 to 109 for Atmel AVR UC3 A0 144-pin packages
- 0 to 69 for Atmel AVR UC3 A1 100-pin packages
- 0 to 109 for Atmel AVR UC3 A3 144-pin packages
- 0 to 43 for Atmel AVR UC3 B0 64-pin packages
- 0 to 27 for Atmel AVR UC3 B1 48-pin packages
- 0 to 125 for Atmel AVR UC3 C 144-pin packages
- 0 to 83 for Atmel AVR UC3 C 100-pin packages
- 0 to 47 for Atmel AVR UC3 C 64-pin packages
16
ISP_IO_COND_LEVEL
Active level of ISP_IO_COND_PIN that the boot
loader will consider as a request for starting the USB
DFU ISP: 0 for GPIO low level, 1 for GPIO high level
31:17
ISP_BOOT_KEY_2
Boot key = 494Fh. This key is used to identify the
word as meaningful for the boot loader
