ATSAM3U ATMEL [ATMEL Corporation], ATSAM3U Datasheet - Page 2

• Manufacturer Part Number: ATSAM3U
• Description: AT91 ARM Thumb-based Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

1.2
1.2.1
1.2.1.1
1.2.1.2
1.2.2
1.2.2.1
1.2.2.2
1.2.2.3
2
Errata
ATSAM3U Errata
Flash Memory
12-bit ADC (ADC12B)
FLASH:
FLASH: Flash issue running at frequency lower than 2.5 MHz
ADC12B: Single Ended Mode
ADC12B: Differential Mode
ADC12B: Wrong Mode after reset
Flash Reading in 64-bit mode
Higher power consumption than expected can be seen when reading Flash in 64-bit mode.
Use 128-bit mode instead.
This issue will be fixed in the next revision.
When the system clock (MCK) is lower then 2.5 MHz with 1 or 2 Wait State (WS) programmed in
the EEFC_FMR, the Cortex fetches wrong instructions.
Do not use 1 or 2 WS when running at a frequency lower than 2.5 MHz.
This issue will be fixed in the next revision.
When enabling a channel in single ended mode, AD12B0 (CH0) for example, the associated
channel in differential mode, AD12B1 and its associated pin are also activated. If the application
is using the PIO pin multiplexed with AD12B1 input, the PIO pin will switch to input Analog Mode
when the channel is enabled. However, the conversion result on AD12B0 channel is not
impacted.
None.
This issue will be fixed in the next revision.
When enabling a channel in differential mode, CH0 (AD12B0-AD12B1 inputs) for example, only
the AD12B0 input will be set to input analog mode automatically by the ADC Controller.
The associated differential input channel, AD12B1 must be enabled by the user’s software, i.e.,
CH1.
This issue will be fixed in the next revision.
After reset the ADC is not in Off Mode, but in Standby Mode leading to current consumption on
VDDANA (1.4 mA. instead of 0.1 µA).
Workaround
Problem Fix
Workaround
Problem Fix
Workaround
Problem Fix
Workaround
Problem Fix
Workaround
6483A–ATARM–04-Aug-09