AT32UC3B064-Z2UR Atmel, AT32UC3B064-Z2UR Datasheet - Page 327
![MCU AVR32 64K FLASH 64-QFN](/photos/12/13/121326/313-64-qfn_sml.jpg)
AT32UC3B064-Z2UR
Manufacturer Part Number
AT32UC3B064-Z2UR
Description
MCU AVR32 64K FLASH 64-QFN
Manufacturer
Atmel
Series
AVR®32 UC3r
Datasheet
1.AT32UC3B164-AUR.pdf
(680 pages)
Specifications of AT32UC3B064-Z2UR
Package / Case
64-QFN
Voltage - Supply (vcc/vdd)
1.65 V ~ 1.95 V
Operating Temperature
-40°C ~ 85°C
Speed
60MHz
Number Of I /o
44
Core Processor
AVR
Program Memory Type
FLASH
Ram Size
16K x 8
Program Memory Size
64KB (64K x 8)
Data Converters
A/D 8x10b
Oscillator Type
Internal
Peripherals
Brown-out Detect/Reset, DMA, POR, PWM, WDT
Connectivity
I²C, IrDA, SPI, SSC, UART/USART, USB
Core Size
32-Bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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Figure 21-30. T = 0 Protocol without Parity Error
Figure 21-31. T = 0 Protocol with Parity Error
21.6.4.3
21.6.4.4
21.6.4.5
32059J–12/2010
Baud Rate
Baud Rate
Clock
I/O
Clock
RXD
Receive Error Counter
Receive NACK Inhibit
Transmit Character Repetition
Start
Bit
Start
Bit
D0
If a parity error is detected by the receiver, it drives the I/O line at 0 during the guard time, as
shown in
the character lasts 1 bit time more, as the guard time length is the same and is added to the
error bit time which lasts 1 bit time.
When the USART is the receiver and it detects an error, it does not load the erroneous character
in the Receive Holding Register (RHR). It appropriately sets the PARE bit in the Status Register
(SR) so that the software can handle the error.
The USART receiver also records the total number of errors. This can be read in the Number of
Error (NER) register. The NB_ERRORS field can record up to 255 errors. Reading NER auto-
matically clears the NB_ERRORS field.
The USART can also be configured to inhibit an error. This can be achieved by setting the
INACK bit in the Mode Register (MR). If INACK is at 1, no error signal is driven on the I/O line
even if a parity bit is detected.
Moreover, if INACK is set, the erroneous received character is stored in the Receive Holding
Register, as if no error occurred. However, the RXRDY bit does raise.
When the USART is transmitting a character and gets a NACK, it can automatically repeat the
character before moving on to the next one. Repetition is enabled by writing the
MAX_ITERATION field in the Mode Register (MR) at a value higher than 0. Each character can
be transmitted up to eight times; the first transmission plus seven repetitions.
If MAX_ITERATION does not equal zero, the USART repeats the character as many times as
the value loaded in MAX_ITERATION.
D0
D1
D1
Figure
D2
D2
21-31. This error bit is also named NACK, for Non Acknowledge. In this case,
D3
D3
D4
D4
D5
D5
D6
D6
D7
D7
Parity
Bit
Parity
Bit
Time 1
Guard
Time 1
Guard
Error
Time 2
Guard
Time 2
Guard
Start
Next
Bit
AT32UC3B
Start
Bit
Repetition
D0
D1
327
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