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ATmega32U2 Datasheet(PDF) 230 Page - ATMEL Corporation

Part # ATmega32U2
Description  8-bit Microcontroller with 8/16/32K Bytes of ISP Flash and USB Controller
PDF  314 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega32U2 Datasheet(HTML) 230 Page - ATMEL Corporation

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230
7799B–AVR–07/09
ATmega8U2/16U2/32U2
Note:
1. “1” means unprogrammed, “0” means programmed
Note:
1. “1” means unprogrammed, “0” means programmed
23.6
Entering the Boot Loader Program
The bootloader can be executed with three different conditions:
23.6.1
Regular application conditions.
A jump or call from the application program. This may be initiated by a trigger such as a com-
mand received via USART, or SPI interface.
23.6.2
Boot Reset Fuse
The Boot Reset Fuse (BOOTRST) can be programmed so that the Reset Vector is pointing to
the Boot Flash start address after a reset. In this case, the Boot Loader is started after a reset.
After the application code is loaded, the program can start executing the application code. Note
that the fuses cannot be changed by the MCU itself. This means that once the Boot Reset Fuse
Table 23-2.
Boot Lock Bit0 Protection Modes (Application Section)(1)
BLB0 Mode
BLB02
BLB01
Protection
11
1
No restrictions for SPM or (E)LPM accessing the Application
section.
2
1
0
SPM is not allowed to write to the Application section.
30
0
SPM is not allowed to write to the Application section, and
(E)LPM executing from the Boot Loader section is not allowed
to read from the Application section. If Interrupt Vectors are
placed in the Boot Loader section, interrupts are disabled while
executing from the Application section.
40
1
(E)LPM executing from the Boot Loader section is not allowed
to read from the Application section. If Interrupt Vectors are
placed in the Boot Loader section, interrupts are disabled while
executing from the Application section.
Table 23-3.
Boot Lock Bit1 Protection Modes (Boot Loader Section)
(1)
BLB1 Mode
BLB12
BLB11
Protection
11
1
No restrictions for SPM or (E)LPM accessing the Boot Loader
section.
2
1
0
SPM is not allowed to write to the Boot Loader section.
30
0
SPM is not allowed to write to the Boot Loader section, and
(E)LPM executing from the Application section is not allowed to
read from the Boot Loader section. If Interrupt Vectors are
placed in the Application section, interrupts are disabled while
executing from the Boot Loader section.
40
1
(E)LPM executing from the Application section is not allowed to
read from the Boot Loader section. If Interrupt Vectors are
placed in the Application section, interrupts are disabled while
executing from the Boot Loader section.



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