ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 342

• Manufacturer Part Number: ATxmega128B1
• Manufacturer: Atmel Corporation

Specifications of ATxmega128B1

• Flash (kbytes): 128 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 53
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Segment Lcd: 160
• 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
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 8
• 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: 3
• Output Compare Channels: 10
• Input Capture Channels: 10
• Pwm Channels: 10
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

25.15.11.2
25.15.12 CMPH – Compare Register High
25.15.13 CMPL – Compare Register Low
25.16 Register Description - ADC Channel
25.16.1
8291A–AVR–10/11
CTRL – Control Register
12-bit Mode, Left Adjusted
• Bit 7:4 – CHRES[3:0]: Channel Result Low
These are the four lsbs of the 12-bit ADC result.
• Bit 3:0 – 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.
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]: Compare Value High
These are the eight msbs of the 16-bit ADC compare value. In signed mode, the number repre-
sentation is 2's complement, and the msb is the sign bit.
• Bit 7:0 – CMP[7:0]: Compare Value Low
These are the eight lsbs of the 16-bit ADC compare value. In signed mode, the number repre-
sentation 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 this bit is equivalent to writing the CH[3:0]START bits in
page
Bit
+0x18
Read/Write
Initial Value
Bit
+0x19
Read/Write
Initial Value
Bit
+0x00
Read/Write
Initial Value
336.
START
R/W
7
0
R/W
R/W
7
0
7
0
R
R/W
6
–
0
R/W
6
0
6
0
”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
R/W
R/W
3
0
3
0
3
0
Atmel AVR XMEGA B
R/W
R/W
R/W
2
0
”CTRLA – Control register A” on
2
0
2
0
11.
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
CMPH
CMPL
CTRL
342