AT32UC3L0256 Atmel Corporation, AT32UC3L0256 Datasheet - Page 39

• Manufacturer Part Number: AT32UC3L0256
• Manufacturer: Atmel Corporation

Specifications of AT32UC3L0256

• Flash (kbytes): 256 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 50 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 17
• Hardware Qtouch Acquisition: Yes
• Max I/o Pins: 36
• Ext Interrupts: 36
• Usb Speed: No
• Usb Interface: No
• Spi: 5
• Twi (i2c): 2
• Uart: 4
• Lin: 4
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 460
• Analog Comparators: 8
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 16
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.62 to 3.6
• Operating Voltage (vcc): 1.62 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 18
• Input Capture Channels: 12
• Pwm Channels: 35
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

Table 7-11.
Notes:
7.6.2
32145AS–12/2011
Symbol
f
C
C
t
I
OUT
STARTUP
OSC
L
i
1. Please refer to the SCIF chapter for details.
2. Nominal crystal cycles.
3. These values are based on simulation and characterization of other AVR microcontrollers manufactured in the same pro-
32KHz Crystal Oscillator (OSC32K) Characteristics
cess technology. These values are not covered by test limits in production.
Crystal Oscillator Characteristics
Parameter
Crystal oscillator frequency
Crystal load capacitance
Internal equivalent load capacitance
Startup time
Current consumption
where the crystal load capacitance
can be found in the crystal datasheet. The capacitance of the external capacitors (C
then be computed as follows:
where C
Figure 7-3.
Figure 7-3
must choose a crystal oscillator where the crystal load capacitance C
in the table. The exact value of C
UC3L
C
PCB
i
(3)
and the equation above also applies to the 32 KHz oscillator connection. The user
is the capacitance of the PCB and
(3)
Oscillator Connection
XOUT
XIN
Conditions
SCIF.OSCCTRL.GAIN = 2
Active mode, f = 0.45MHz,
SCIF.OSCCTRL.GAIN = 0
Active mode, f = 10MHz,
SCIF.OSCCTRL.GAIN = 2
L
can then be found in the crystal datasheet.
C
C
L
LEXT
is within the range given in the table. The exact value of C
=
2 C
C
(
L
C
L
i
–
is the internal equivalent load capacitance.
C
(1)
i
) C
–
PCB
AT32UC3L0128/256
0.45
Min
6
C
C
LEXT
LEXT
30 000
Typ
220
10
30
L
2
is within the range given
(2)
Max
16
18
LEXT
cycles
MHz
Unit
µA
pF
) can
39
L