ATxmega16D4 Atmel Corporation, ATxmega16D4 Datasheet - Page 237

• 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

20.12.5
8210B–AVR–04/10
PRESCALER - ADC Clock Prescaler register
• Bits 7:6 - Reserved
These bits are unused and reserved for future use. For compatibility reasons, always write these
bits to zero when this register is written.
• Bits 5:3 - EVSEL[2:0]: event channel input select
These bits define which event channel should trigger the ADC. See
Table 20-3.
• Bits 2:1 - Reserved
These bits are unused and reserved for future use. For compatibility reasons, always write these
bits to zero when this register is written.
• Bits 0 - EVACT0: ADC Event Mode
Setting this bit to one will enable the event line defined by EVSEL to trigger the conversion. Writ-
ing this bit to zero disable ADC event triggering.
• Bits 7:3 - Reserved
These bits are reserved and will always read as zero. For compatibility reasons always write
these bits to zero when this register is written.
• Bits 2:0 - PRESCALER[2:0]: ADC Prescaler configuration
These bits define the ADC clock relative to the Peripheral clock, according to
page
Table 20-4.
Bit
+0x04
Read/Write
Initial Value
PRESCALER[2:0]
EVSEL[2:0]
237.
000
001
010
011
111
000
001
010
011
100
R
7
–
0
ADC Event Line Select
ADC Prescaler settings
R
6
–
0
Group Configuration
Group Configuration
R
5
–
0
0
1
2
3
DIV16
DIV32
DIV64
DIV4
DIV8
R
4
–
0
Selected event lines
Event channel 0 selected inputs
Event channel 1 as selected input
Event channel 2 as selected input
Event channel 3 as selected input
Reserved
R
3
–
0
R/W
2
0
System clock division factor
PRESCALER[2:0]
Table 20-3 on page
R/W
1
0
16
32
64
4
8
XMEGA D
R/W
0
0
Table 20-4 on
PRESCALER
237.
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