AT32UC3L064_1 Datasheet, PDF (44/825 Pages) ATMEL Corporation – AVR32 32-bit Microcontroller

Figure 7-2. High Speed Mode
Frequency
AT32UC3L
1 wait state
0 wait state
Frequency limit
for 0 wait state
operation
Normal _High
Speed mode
7.4.6
7.4.7
Quick Page Read
A dedicated command, Quick Page Read (QPR), is provided to read all words in an
addressed page. All bits in all words in this page are AND’ed together, returning a 1-bit result.
This result is placed in the Quick Page Read Result (QPRR) bit in Flash Status Register
(FSR). The QPR command is useful to check that a page is in an erased state. The QPR
instruction is much faster than performing the erased-page check using a regular software
subroutine.
Page Buffer Operations
The flash memory has a write and erase granularity of one page; data is written and erased in
chunks of one page. When programming a page, the user must first write the new data into the
Page Buffer. The contents of the entire Page Buffer is copied into the desired page in flash
memory when the user issues the Write Page command, Refer to Section 7.5.1 on page 47.
In order to program data into flash page Y, write the desired data to locations Y0 to Y31 in the
regular flash memory map. Writing to an address A in the flash memory map will not update
the flash memory, but will instead update location A%32 in the page buffer. The PAGEN field
in the Flash Command (FCMD) register will at the same time be updated with the value A/32.
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