AT32UC3B0512-A2UT Atmel, AT32UC3B0512-A2UT Datasheet - Page 124

• Manufacturer Part Number: AT32UC3B0512-A2UT
• Description: IC MCU AVR32 512K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR®32 UC3r

Specifications of AT32UC3B0512-A2UT

• Core Processor: AVR
• Core Size: 32-Bit
• Speed: 60MHz
• Connectivity: I²C, IrDA, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 44
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 96K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Controller Family/series: AT32UC3B
• No. Of I/o's: 44
• Ram Memory Size: 96KB
• Cpu Speed: 60MHz
• No. Of Timers: 1
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

14.5.1
14.5.2
32059K–03/2011
Write/erase page operation
Erase All operation
All the commands are protected by the same keyword, which has to be written in the eight high-
est bits of FCMD. Writing FCMD with data that does not contain the correct key and/or with an
invalid command has no effect on the flash memory; however, the PROGE bit is set in FSR. This
bit is automatically cleared by a read access to FSR.
Writing a command to FCMD while another command is being executed has no effect on the
flash memory; however, the PROGE bit is set in FSR. This bit is automatically cleared by a read
access to FSR.
If the current command writes or erases a page in a locked region, or a page protected by the
BOOTPROT fuses, the command has no effect on the flash memory; however, the LOCKE bit is
set in FSR . This bit is automatically cleared by a read access to FSR.
Flash technology requires that an erase must be done before programming. The entire flash can
be erased by an Erase All command. Alternatively, pages can be individually erased by the
Erase Page command.
The User page can be written and erased using the mechanisms described in this chapter.
After programming, the page can be locked to prevent miscellaneous write or erase sequences.
Locking is performed on a per-region basis, so locking a region locks all pages inside the region.
Additional protection is provided for the lowermost address space of the flash. This address
space is allocated for the Boot Loader, and is protected both by the lock bit(s) corresponding to
this address space, and the BOOTPROT[2:0] fuses.
Data to be written are stored in an internal buffer called page buffer. The page buffer contains w
words. The page buffer wraps around within the internal memory area address space and
appears to be repeated by the number of pages in it. Writing of 8-bit and 16-bit data to the page
buffer is not allowed and may lead to unpredictable data corruption.
Data must be written to the page buffer before the programming command is written to FCMD.
The sequence is as follows:
Two errors can be detected in FSR after a programming sequence:
The entire memory is erased if the Erase All command (EA) is written to FCMD. Erase All erases
all bits in the flash array. The User page is not erased. All flash memory locations, the general-
purpose fuse bits, and the security bit are erased (reset to 0xFF) after an Erase All.
• Reset the page buffer with the Clear Page Buffer command.
• Fill the page buffer with the desired contents, using only 32-bit access.
• Programming starts as soon as the programming key and the programming command are
• When programming is completed, the bit FRDY in FSR is set. If an interrupt was enabled by
• Programming Error: A bad keyword and/or an invalid command have been written in FCMD.
• Lock Error: The page to be programmed belongs to a locked region. A command must be
written to the Flash Command Register. The FCMD.PAGEN field must contain the address of
the page to write. PAGEN is automatically updated when writing to the page buffer, but can
also be written to directly. The FRDY bit in FSR is automatically cleared when the page write
operation starts.
setting the bit FRDY in FCR, the interrupt line of the flash controller is set.
executed to unlock the corresponding region before programming can start.
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