ATxmega16D4 Atmel Corporation, ATxmega16D4 Datasheet - Page 235

• 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

20.12.2
8210B–AVR–04/10
CTRLB - ADC Control Register B
Setting this bit will start an ADC conversion. Bit is cleared by hardware when the conversion has
started. Writing this bit is equivalent to writing the START bits inside the ADC channel register.
• Bit 1 – FLUSH: ADC Flush:
Writing this bit to one will flush the ADC. When this is done the ADC Clock will be restarted on
the next Peripheral clock edge and any ongoing conversion in progress is aborted and lost.
After the flush and the ADC Clock restart, any new conversions pending will start.
• Bit 0 – ENABLE: ADC Enable
Setting this bit enables the ADC.
• Bits 7:5 - Reserved
These bits are unused and reserved for future use. For compatibility reasons, always write these
bits to zero when this register is written.
• Bit 4 - CONVMODE: ADC Conversion Mode
This bit controls whether the ADC should work in signed or unsigned mode. By default this bit is
zero and the ADC is then configured for unsigned mode where single ended and internal signals
can be measured. When this bit is set to one the ADC is configured for signed mode where also
differential input can be used.
• Bit 3 - FREERUN: ADC Free Running Mode
This bit controls the free running mode for the ADC. Once a conversion is finished, the next input
will be sampled and converted.
• Bits 2:1 - RESOLUTION[1:0]: ADC Conversion Result Resolution
These bits define whether the ADC completes the conversion at 12- or 8-bit result. They also
define whether the 12-bit result is left or right oriented in the 16-bit result registers.
See
Table 20-1.
• Bit 0 - Reserved
This bit is unused and reserved for future use. For compatibility reasons, always write this bit to
zero when this register is written.
Bit
+0x01
Read/Write
Initial Value
RESOLUTION[1:0]
Table 20-1 on page 235
00
01
10
11
7
–
R
0
ADC Conversion Result resolution
R
6
–
0
Group Configuration
for possible settings.
R
5
–
0
LEFT12BIT
12BIT
8BIT
CONVMODE
R/W
4
0
FREERUN
R/W
3
0
Description
12-bit result, right adjusted
Reserved
8-bit result, right adjusted
12-bit result, left adjusted
R/W
RESOLUTION[1:0]
2
0
R/W
1
0
XMEGA D
R
0
–
0
CTRLB
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