ATxmega16D4 Atmel Corporation, ATxmega16D4 Datasheet - Page 56

• Manufacturer Part Number: ATxmega16D4
• Manufacturer: Atmel Corporation

Specifications of ATxmega16D4

• Flash (kbytes): 16 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• 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): 2
• Eeprom (bytes): 1024
• 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

6.3
6.3.1
6.3.2
8210B–AVR–04/10
Clock Distribution
System Clock - clk
CPU Clock - clk
Figure 6-1.
Figure 6-1 on page 56
The System Clock is the output from the main system clock selection. This is fed into the pres-
calers that are used to generate all internal clocks except the Asynchronous Clock.
The CPU Clock is routed to the CPU and Non-Volatile Memory. Halting the CPU Clock inhibits
the CPU from executing instructions.
CPU
Brown-out
Detection
SYS
The Clock system, clock sources and clock distribution
Real Time
Counter
Watchdog
Int. ULP
32 kHz
Timer
clk
rtc
presents the principal clock distribution in the XMEGA.
32.768 kHz
Int. Osc.
Peripherals
clk
PER4
clk
PER2
clk
PER
Int. Osc.
2 MHz
RAM
System Clock Multiplexer
System Clock
Prescalers
clk
Int. Osc.
32 MHz
PLL
SYS
32.768 kHz
XTAL
AVR CPU
clk
CPU
0.4–16Mhz
XMEGA D
XTAL
Non-Volatile
Memory
External
Clock
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