Datasheet

32059L–AVR32–01/2012

AT32UC3B

2. The command Quick Page Read User Page(QPRUP) is not functional

The command Quick Page Read User Page(QPRUP) is not functional.

Fix/Workaround

None.

3. PAGEN Semantic Field for Program GP Fuse Byte is WriteData[7:0], ByteAddress[1:0]

on revision B instead of WriteData[7:0], ByteAddress[2:0]

PAGEN Semantic Field for Program GP Fuse Byte is WriteData[7:0], ByteAddress[1:0] on

revision B instead of WriteData[7:0], ByteAddress[2:0].

Fix/Workaround

None.

4. Reading from on-chip flash may fail after a flash fuse write operation (FLASHC LP,

UP, WGPB, EGPB, SSB, PGPFB, EAGPF commands).

After a flash fuse write operation (FLASHC LP, UP, WGPB, EGPB, SSB, PGPFB, EAGPF

commands), the following flash read access may return corrupted data. This erratum does

not affect write operations to regular flash memory.

Fix/Workaround

The flash fuse write operation (FLASHC LP, UP, WGPB, EGPB, SSB, PGPFB, EAGPF

commands) must be issued from internal RAM. After the write operation, perform a dummy

flash page write operation (FLASHC WP). Content and location of this page is not important

and filling the write buffer with all one (FFh) will leave the current flash content unchanged. It

is then safe to read and fetch code from the flash.

- RTC

1. Writes to control (CTRL), top (TOP) and value (VAL) in the RTC are discarded if the

RTC peripheral bus clock (PBA) is divided by a factor of four or more relative to the

HSB clock

Writes to control (CTRL), top (TOP) and value (VAL) in the RTC are discarded if the RTC

peripheral bus clock (PBA) is divided by a factor of four or more relative to the HSB clock.

Fix/Workaround

Do not write to the RTC registers using the peripheral bus clock (PBA) divided by a factor of