AT32UC3A0512_14 datasheet(83/98 Pages) ATMEL

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AT32UC3A0512 Datasheet(PDF) 83 Page - ATMEL Corporation

Part #	AT32UC3A0512

Description	High Performance, Low Power 32-Bit Atmel AVR Microcontroller

Download	98 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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83 / 98 page

AT32UC3A

RETS behaves incorrectly when MPU is enabled and MPU is configured so that

system stack is not readable in unprivileged mode.

Fix/Woraround

Workaround 1: Make system stack readable in unprivileged mode,

Workaround 2: Return from supervisor mode using rete instead of rets. This

requires :

1. Changing the mode bits from 001b to 110b before issuing the instruction.

Updating the mode bits to the desired value must be done using a single mtsr

instruction so it is done atomically. Even if this step is described in general

as not safe in the UC technical reference guide, it is safe in this very

specific case.

2. Execute the RETE instruction.

32058KS–AVR32–01/12

Manufacturer	Part #	Datasheet	Description
ATMEL Corporation	AT32UC3A0512	11Mb / 826P	AVR32 32-Bit Microcontroller

Manufacturer	Part #	Datasheet	Description
ATMEL Corporation	AT32UC3A3256S	1Mb / 94P	High Performance, Low Power 32-bit Atmel AVR Microcontroller
	AT32UC3B0512	1Mb / 107P	High Performance, Low Power 32-Bit Atmel AVR Microcontroller
	AT32UC3L064	1Mb / 113P	High-performance, Low-power 32-bit Atmel AVR Microcontroller
	AT32UC3L0128	1Mb / 96P	32-bit Atmel AVR Microcontroller
	AT32UC3L064	1Mb / 111P	32-bit Atmel AVR Microcontroller
	AT32UC3L0256-D3HT	1Mb / 96P	32-bit Atmel AVR Microcontroller
	AT32UC3C0512C	2Mb / 110P	High Performance, Low Power 32-bit AVR Microcontroller
	AT32UC3C0512C	2Mb / 110P	High Performance, Low Power 32-bit AVR Microcontroller
	ATA5505	5Mb / 294P	High Performance, Low Power Atmel AVR 8-bit Microcontroller Advanced RISC Architecture
	ATMEGA64	7Mb / 414P	High-performance, Low-power Atmel AVR

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