ATxmega256A3 Atmel Corporation, ATxmega256A3 Datasheet - Page 310

• Manufacturer Part Number: ATxmega256A3
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3

• Flash (kbytes): 256 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 50
• Ext Interrupts: 50
• Usb Speed: No
• Usb Interface: No
• Spi: 10
• Twi (i2c): 2
• Uart: 7
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 16
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 16
• Eeprom (bytes): 4096
• 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: 7
• Output Compare Channels: 22
• Input Capture Channels: 22
• Pwm Channels: 22
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

25.17.2
8077H–AVR–12/09
MUXCTRL - ADC Channel MUX Control registers
See
settings, see
Table 25-8.
• Bit 1:0 - INPUTMODE[1:0]: Channel Input Mode
These bits define the channel mode. This setting is independent of the ADC CONVMODE
(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.
Table 25-9.
Table 25-10. Channel Input Modes, CONVMODE=1 (signed mode)
The MUX register defines the input source for the channel.
Bit
+0x01
Read/Write
Initial Value
INPUTMODE[1:0]
INPUTMODE[1:0]
Table 25-6 on page 305
GAIN[2:0]
000
001
010
011
100
101
110
111
00
01
10
11
00
01
10
11
”MUXCTRL - ADC Channel MUX Control registers” on page
ADC Gain Factor
Channel Input Modes, CONVMODE=0 (unsigned mode)
R
7
0
-
R/W
6
0
Group Configuration
Group Configuration
Group Configuration
for different gain factor settings. Gain is only valid with certain MUX
SINGLEENDED
SINGLEENDED
DIFFWGAIN
INTERNAL
INTERNAL
R/W
DIFF
16X
32X
64X
5
0
1X
2X
4X
8X
MUXPOS[3:0]
R/W
4
0
R/W
Description
Internal positive input signal
Single-ended positive input signal
Reserved
Reserved
Description
Internal positive input signal
Single-ended positive input signal
Differential input signal
Differential input signal with gain
3
0
R
2
0
-
Gain factor
Reserved
R/W
16x
32x
64x
1
0
1x
2x
4x
8x
MUXNEG[1:0]
310.
XMEGA A
R/W
0
0
MUXCTRL
310