ATxmega64D4 Atmel Corporation, ATxmega64D4 Datasheet - Page 241

• Manufacturer Part Number: ATxmega64D4
• Manufacturer: Atmel Corporation

Specifications of ATxmega64D4

• Flash (kbytes): 64 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): 4
• 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

20.13 Register Description - ADC Channel
20.13.1
8210B–AVR–04/10
CTRL - ADC Channel Control Register
• Bit 7 - START: START Conversion on Channel
Writing this to one will start a conversion on the channel. The bit is cleared by hardware when
the conversion has started. Writing this bit to one when it already is set will have no effect. Writ-
ing or reading these bits is equivalent to writing the CH0START bit in
Register A” on page
• Bits 6:5 - 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 4:2 - GAIN[2:0]: ADC Gain Factor
These bits define the gain factor in order to amplify input signals before the ADC conversion.
See
settings, see
Table 20-5.
• Bit 1:0 - INPUTMODE[1:0]: ADC Input Mode
These bits define the ADC Channel input mode. This setting is independent of the ADC CONV-
MODE (signed/unsigned mode) setting, but differential input mode can only be done in ADC
signed mode. In single ended input mode, the negative input to the ADC will be connected to a
fixed value both for ADC signed and unsigned mode.
Bit
+0x00
Read/Write
Initial Value
Table 20-5 on page 241
GAIN[2:0]
000
001
010
011
100
101
110
111
START
”MUXCTRL - ADC Channel MUX Control registers” on page
R/W
7
0
ADC Gain Factor
234.
R
6
–
0
Group Configuration
for different gain factor settings. Gain is only valid with certain MUX
R
5
–
0
DIV2
16X
32X
64X
1X
2X
4X
8X
R/W
4
0
GAIN[2:0}
R/W
3
0
R/W
2
0
Gain factor
R/W
INPUTMODE[1:0]
1
0
1/2x
16x
32x
64x
”CTRLA - ADC Control
1x
2x
4x
8x
242.
XMEGA D
R/W
0
0
CTRL
241