ATxmega16D4 Atmel Corporation, ATxmega16D4 Datasheet - Page 236

• 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

20.12.3
20.12.4
8210B–AVR–04/10
REFCTRL - ADC Reference Control register
EVCTRL - ADC Event Control Register
• Bit 7 – Reserved
This bit is unused and reserved for future use. For compatibility reasons, always write this bit to
zero when this register is written.
• Bits 6:4 – REFSEL[2:0]: ADC Reference Selection
These bits selects the reference and conversion range for the ADC according to
page
Table 20-2.
Notes:
• Bit 3:2 – Reserved
These bits are unused and reserved for future use. For compatibility reasons, always write these
bits to zero when this register is written.
• Bit 1 – BANDGAP: Bandgap enable
Setting this bit enables the bandgap to prepare for ADC measurement. Note that if any other
functions are using the bandgap already, this bit does not need to be set. This could be when the
internal 1.00V reference is used in ADC or if the Brown-out Detector is enabled.
• Bit 0 – TEMPREF: Temperature Reference enable
Setting this bit enables the temperature reference to prepare for ADC measurement.
Bit
+0x02
Read/Write
Initial Value
Bit
+0x03
Read/Write
Initial Value
REFSEL[2:0]
236.
1. Only available if AREF exist on PORT A.
2. Only available it AREF exist on PORT B.
010
011
000
001
100
101
110
111
(1)
(2)
R
7
–
0
7
–
R
0
ADC Reference Configuration
R/W
6
–
R
0
6
0
Group Configuration
REFSEL[2:0]
INTVCC
AREFB
AREFA
INT1V
R/W
R/W
5
0
5
0
EVSEL[2:0]
R/W
R/W
4
0
4
0
Description
Internal 1.00V
Internal V
External reference from AREF pin on PORT A.
External reference from AREF pin on PORT B.
R/W
R
3
–
0
3
0
CC
/1.6
R
2
–
0
R
2
–
0
BANDGAP
R/W
1
0
R
1
–
0
XMEGA D
TEMPREF
EVACT0
R/W
R/W
0
0
0
0
Table 20-2 on
REFCTRL
EVCTRL
236