ATxmega128D4 Atmel Corporation, ATxmega128D4 Datasheet - Page 58
ATxmega128D4
Manufacturer Part Number
ATxmega128D4
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega128D4
Flash (kbytes)
128 Kbytes
Pin Count
44
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
34
Ext Interrupts
34
Usb Speed
No
Usb Interface
No
Spi
4
Twi (i2c)
2
Uart
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
12
Adc Speed (ksps)
200
Analog Comparators
2
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
8
Eeprom (bytes)
2048
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.6 to 3.6
Operating Voltage (vcc)
1.6 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
4
Output Compare Channels
14
Input Capture Channels
14
Pwm Channels
14
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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6.4.1.4
6.4.2
6.4.2.1
6.4.2.2
6.4.2.3
8210B–AVR–04/10
External Clock Sources
2 MHz Run-time Calibrated Internal Oscillator
0.4 - 16 MHz Crystal Oscillator
External Clock Input
32.768 kHz Crystal Oscillator
This RC oscillator provides an approximate 2 MHz clock. The oscillator employs a Digital Fre-
quency Looked Loop (DFLL) that can be enabled for automatic run-time calibration of the
oscillator. A factory-calibrated value is written to the 2 MHz DFLL Calibration Register during
reset to ensure that the oscillator is running within its specification. The calibration register can
also be written from software for manual run-time calibration of the oscillator.
The XTAL1 and XTAL2 pins can be used to drive an external oscillator, either a quartz crystal or
a ceramic resonator. XTAL1 can be used as input for an external clock signal. The TOSC1 and
TOSC2 pins is dedicated for driving a 32.768 kHz crystal oscillator.
This oscillator can operate in four different modes, optimized for different frequency ranges, all
within 0.4 - 16 MHz.
Figure 6-2.
Two capacitors, C1 and C2, may be added to match the required load capacitance for the con-
nected crystal.
To drive the device from an external clock source, XTAL1 must be driven as shown in
3 on page
Figure 6-3.
A 32.768 kHz crystal oscillator can be connected between TOSC1 and TOSC2 by enabling a
dedicated Low Frequency Oscillator input circuit. A typical connection is shown in Figure
58. In this mode, XTAL2 can be used as a general I/O pin.
Crystal Oscillator Connection
External Clock Drive Configuration
Figure 6-2
P u r p o s e
E x te r n a l
G e n e r a l
shows a typical connection of a crystal oscillator or resonator.
S ig n a l
C lo c k
I/O
C 2
C 1
X T A L 2
X T A L 1
X T A L 2
X T A L 1
G N D
XMEGA D
Figure 6-
Figure
58
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