ATxmega32A4U Atmel Corporation, ATxmega32A4U Datasheet - Page 373

• Manufacturer Part Number: ATxmega32A4U
• Manufacturer: Atmel Corporation

Specifications of ATxmega32A4U

• Flash (kbytes): 32 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 Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 7
• Twi (i2c): 2
• Uart: 5
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 2
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 4
• 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: 5
• Output Compare Channels: 16
• Input Capture Channels: 16
• Pwm Channels: 16
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

28.16.12 CMPH – Compare register High
28.16.13 CMPL – Compare register Low
28.17 Register Description - ADC Channel
28.17.1
8331A–AVR–07/11
CTRL – Channel Control Register
• Bit 3:0 – Reserved
These bits are reserved and will always read as zero. For compatibility with future devices,
always write these bits to zero when this register is written.
The CMPH and CMPL register pair represents the 16-bit value CMP. For details on reading and
writing 16-bit registers refer to
• Bit 7:0 – CMP[15:0]: ADC Compare value high byte
These are the 8 MSB of the 16-bit ADC compare value. In signed mode, the number representa-
tion is 2's complement and the MSB is the sign bit.
• Bit 7:0 – CMP[7:0]: ADC compare value high byte
These are the 8 LSB of the 16-bit ADC compare value. In signed mode, the number representa-
tion is 2's complement.
• Bit 7 – START: START Conversion on Channel
Setting this bit will start a conversion on the channel. The bit is cleared by hardware when the
conversion has started. Setting this bit when it already is set will have no effect. Writing or read-
ing these bits is equivalent to writing the CH[3:0]START bits in
page
• Bit 6:5 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always
write these bits to zero when this register is written.
• Bit 4:2 – GAIN[2:0]: ADC Gain Factor
These bits define the gain factor for the ADC gain stage.
Bit
+0x18
Read/Write
Initial Value
Bit
+0x19
Read/Write
Initial Value
Bit
+0x00
Read/Write
Initial Value
366.
START
R/W
7
0
R/W
R/W
7
0
7
0
R
R/W
6
–
0
R/W
6
0
6
0
Section 3.11 ”Accessing 16-bit Registers” on page
R/W
R
R/W
5
–
0
5
0
5
0
R/W
R/W
R/W
4
0
4
0
4
0
CMP[15:0]
CMP[7:0]
GAIN[2:0]
R/W
Atmel AVR XMEGA AU
R/W
R/W
3
0
3
0
3
0
R/W
R/W
R/W
2
0
2
0
2
0
”CTRLA – Control Register A” on
R/W
R/W
R/W
INPUTMODE[1:0]
1
0
1
0
1
0
R/W
R/W
R/W
0
0
0
0
0
0
12.
CMPH
CMPL
CTRL
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