ATEVK1104S Atmel, ATEVK1104S Datasheet - Page 81

• Manufacturer Part Number: ATEVK1104S
• Description: KIT EVAL FOR AT32UC
• Manufacturer: Atmel
• Series: AVR®32 UC3r
• Type: MCUr

Specifications of ATEVK1104S

• Contents: Board, Cables
• Tool Type: Development Kit
• Cpu Core: AVR 32
• Data Bus Width: 32 bit
• Processor Series: AT32
• Processor To Be Evaluated: AT32UC3A3256S
• Interface Type: USB, JTAG, SD Card, Nexus, MMC
• Core Architecture: AVR
• Operating Supply Voltage: 5.5 V
• For Use With/related Products: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

13.1.7
13.1.8
13.1.9
13.2
13.2.1
32072C–AVR32–2010/03
Rev. E
AES
HMATRIX
TWIM
General
1. URAD (Unspecified Register Access Detection Status) does not detect read accesses
1. In the HMATRIX PRAS and PRBS registers MxPR fields are only two bits
1. TWIM SR.IDLE goes high immediately when NAK is received
1. 3.3V supply monitor is not available on revE.
2. Service access bus (SAB) can not access DMACA registers.
3. Increased Power Consumption in VDDIO in sleep modes.
Fix/workaround:
Disable and then enable the peripheral after the transfer error.
to the write-only KEYW[5..8]R registers
Fix/Workaround
None.
In the HMATRIX PRAS and PRBS registers MxPR fields are only two bits wide, instead of
four bits. The unused bits are undefined when reading the registers.
Fix/Workaround
Mask undefined bits when reading PRAS and PRBS.
When a NAK is received and there is a non-zero number of bytes to be transmitted,
SR.IDLE goes high immediately and does not wait for the STOP condition to be sent. This
does not cause any problem just by itself, but can cause a problem if software waits for
SR.IDLE to go high and then immediately disables the TWIM by writing a one to CR.MDIS.
Disabling the TWIM causes the TWCK and TWD pins to go high immediately, so the STOP
condition will not be transmitted correctly.
Fix/Workaround
If possible, do not disable the TWIM. If it is absolutely necessary to disable the TWIM, there
must be a software delay of at least two TWCK periods between the detection of
SR.IDLE==1 and the disabling of the TWIM.
3.3V supply monitor is not available on revE.
Fix/workaround
None.
Workaround
None.
If the OSC0 is enabled in crystal mode when entering a sleep mode where the OSC0 is dis-
abled, this will lead to an increased power consumption in VDDIO.
Workaround
Disable OSC0 manually through the Power Manager (PM) before going to any sleep modes
where the OSC0 is disabled automatically, or pull down or up XIN0 or XOUT0 with 1Mohm
resistor.
AT32UC3A3/A4
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