AT32UC3C2256C Atmel Corporation, AT32UC3C2256C Datasheet - Page 606

• Manufacturer Part Number: AT32UC3C2256C
• Manufacturer: Atmel Corporation

Specifications of AT32UC3C2256C

• Flash (kbytes): 256 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 45
• Ext Interrupts: 64
• Usb Transceiver: 1
• Quadrature Decoder Channels: 1
• Usb Speed: Full Speed
• Usb Interface: Device + OTG
• Spi: 5
• Twi (i2c): 2
• Uart: 4
• Can: 2
• Lin: 4
• Ssc: 1
• Ethernet: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 2
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 68
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0 to 3.6 or 4.5 to 5.5
• Operating Voltage (vcc): 3.0 to 3.6 or 4.5 to 5.5
• Fpu: Yes
• Mpu / Mmu: Yes / No
• Timers: 3
• Output Compare Channels: 13
• Input Capture Channels: 6
• Pwm Channels: 14
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

25.6.9.9
32117C–AVR-08/11
Identifier Parity
F
LIN Standard imposes that it must not exceed ±15%. The LIN Standard imposes also that for
communication between two nodes, their bit rate must not differ by more than ±2%. This means
that the Baudrate_deviation must not exceed ±1%.
It follows from that, a minimum value for the nominal clock frequency:
Examples:
If the fractional baud rate is not used, the accuracy of the synchronization becomes much lower.
When the counter is stopped, the 16 most significant bits of the counter (value divided by 8)
gives the new clock divider (CD). This value is rounded by adding the first insignificant bit. The
equation of the Baudrate deviation is the same as given above, but the constants are as follows:
It follows from that, a minimum value for the nominal clock frequency:
Examples:
A protected identifier consists of two sub-fields; the identifier and the identifier parity. Bits 0 to 5
are assigned to the identifier and bits 6 and 7 are assigned to the parity.
The USART interface can generate/check these parity bits, but this feature can also be disabled.
The user can choose between two modes by the PARDIS bit of the LIN Mode register (LINMR):
TOL_UNSYNCH
• Baudrate = 20 kbit/s, Over=0 (Oversampling 16X) => F
• Baudrate = 20 kbit/s, Over=1 (Oversampling 8X) => F
• Baudrate = 1 kbit/s, Over=0 (Oversampling 16X) => F
• Baudrate = 1 kbit/s, Over=1 (Oversampling 8X) => F
• Baudrate = 20 kbit/s, Over=0 (Oversampling 16X) => F
• Baudrate = 20 kbit/s, Over=1 (Oversampling 8X) => F
• Baudrate = 1 kbit/s, Over=0 (Oversampling 16X) => F
• Baudrate = 1 kbit/s, Over=1 (Oversampling 8X) => F
is the deviation of the real slave node clock from the nominal clock frequency. The
Baudrate_deviation
F
F
NOM
NOM
(
(min)
min
)
=
=
⎛
⎜
⎜
⎜
⎝
⎛
⎜
⎜
⎜
⎝
100
100
×
×
=
[
------------------------------------------------------------------------------------------ -
4
[
----------------------------------------------------------------------------------------------- -
⎛
⎜
⎜
⎜
⎝
0.5
×
100
–
–
8
4
0.5
×
×
≤
8
(
×
8
α +4
2 Over
×
≤
α [
-------------------------------------------------------------------------------------------- -
×
–
≤
8
⎛
⎝
α +0.5
–
--------- -
100
(
×
15
2 Over
≤
×
8
⎛
⎝
–
8
–
--------- -
100
+
×
)
15
×
1
-1 β
+
⎛
⎝
⎞
⎠
(
F
-------------------------------------- -
1
2 Over
+
<
×
TOL_UNSYNCH
] Baudrate
Nom
Nom
–
)
1%
1
×
-1
Nom
Nom
Nom
Nom
+
⎞
⎠
<
Nom
Nom
(min) = 74 kHz
(min) = 485 kHz
100
×
1
+1
<
(min) = 1.47 MHz
(min) = 132 kHz
(min) = 9.71 MHz
(min) = 956 kHz
] Baudrate
1%
β
(min) = 2.64 MHz
(min) = 19.12 MHz
×
)
<
+ ]
+1
β
⎞
⎟
⎟
⎟
⎠
Hz
⎞ xF
⎠
×
Baudrate
Nom
⎞
⎟
⎟
⎟
⎠
Hz
AT32UC3C
⎞
⎟
⎟
⎟
⎠
%
606