AT32UC3B1256-Z1UR Atmel, AT32UC3B1256-Z1UR Datasheet - Page 126

MCU AVR32 256K FLASH 48-QFN

AT32UC3B1256-Z1UR

Manufacturer Part Number
AT32UC3B1256-Z1UR
Description
MCU AVR32 256K FLASH 48-QFN
Manufacturer
Atmel
Series
AVR®32 UC3r
Datasheet

Specifications of AT32UC3B1256-Z1UR

Package / Case
48-QFN Exposed Pad
Voltage - Supply (vcc/vdd)
1.65 V ~ 1.95 V
Operating Temperature
-40°C ~ 85°C
Speed
60MHz
Number Of I /o
28
Core Processor
AVR
Program Memory Type
FLASH
Ram Size
32K x 8
Program Memory Size
256KB (256K x 8)
Data Converters
A/D 6x10b
Oscillator Type
Internal
Peripherals
Brown-out Detect/Reset, DMA, POR, PWM, WDT
Connectivity
I²C, IrDA, SPI, SSC, UART/USART, USB
Core Size
32-Bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
14.5.3
14.6
32059J–12/2010
General-purpose fuse bits
Region lock bits
The EA command also ensures that all volatile memories, such as register file and RAMs, are
erased before the security bit is erased.
Erase All operation is allowed only if no regions are locked, and the BOOTPROT fuses are pro-
grammed with a region size of 0. Thus, if at least one region is locked, the bit LOCKE in FSR is
set and the command is cancelled. If the bit LOCKE has been written to 1 in FCR, the interrupt
line rises.
When the command is complete, the bit FRDY bit in FSR is set. If an interrupt has been enabled
by setting the bit FRDY in FCR, the interrupt line of the flash controller is set. Two errors can be
detected in FSR after issuing the command:
• Programming Error: A bad keyword and/or an invalid command have been written in FCMD.
• Lock Error: At least one lock region to be erased is protected, or BOOTPROT is different from
The flash block has p pages, and these pages are grouped into 16 lock regions, each region
containing p/16 pages. Each region has a dedicated lock bit preventing writing and erasing
pages in the region. After production, the device may have some regions locked. These locked
regions are reserved for a boot or default application. Locked regions can be unlocked to be
erased and then programmed with another application or other data.
To lock or unlock a region, the commands Lock Region Containing Page (LP) and Unlock
Region Containing Page (UP) are provided. Writing one of these commands, together with the
number of the page whose region should be locked/unlocked, performs the desired operation.
One error can be detected in FSR after issuing the command:
• Programming Error: A bad keyword and/or an invalid command have been written in FCMD.
The lock bits are implemented using the lowest 16 general-purpose fuse bits. This means that
lock bits can also be set/cleared using the commands for writing/erasing general-purpose fuse
bits, see chapter 14.6. The general-purpose bit being in an erased (1) state means that the
region is unlocked.
The lowermost pages in the Flash can additionally be protected by the BOOTPROT fuses, see
Section
Each flash block has a number of general-purpose fuse bits that the application programmer can
use freely. The fuse bits can be written and erased using dedicated commands, and read
0. The erase command has been refused and no page has been erased. A Clear Lock Bit
command must be executed previously to unlock the corresponding lock regions.
14.6.
AT32UC3B
126

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