ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 86

• 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

8291A–AVR–10/11
• Bit 6:2 – PSADIV[4:0]: Prescaler A Division Factor
These bits define the division ratio of the clock prescaler A according to
can be written at run-time to change the frequency of the Clk
clock, Clk
Table 7-2.
• Bit 1:0 – PSBCDIV: Prescaler B and C Division Factors
These bits define the division ratio of the clock prescalers B and C according to
caler B will set the clock frequency for the Clk
will set the clock frequency for the Clk
to
Table 7-3.
Figure 7-5 on page 81
PSBCDIV[1:0]
PSADIV[4:0]
00000
00001
00011
00101
00111
01001
01011
01101
01111
10001
10101
10111
11001
11011
11101
11111
SYS
00
01
10
11
.
Prescaler B and C division factors.
Prescaler A division factor.
fore more details.
Group Configuration
Group Configuration
128
256
512
1_1
1_2
4_1
2_2
16
32
64
1
2
4
8
PER
and Clk
PER2
clock relative to the Clk
CPU
Description
No division
Divide by 2
Divide by 4
Divide by 8
Divide by 16
Divide by 32
Divide by 64
Divide by 128
Divide by 256
Divide by 512
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Prescaler B division
No division
No division
Divide by 4
Divide by 2
clocks relative to the Clk
Atmel AVR XMEGA B
PER4
clock relative to the system
PER4
Prescaler C division
No division
Divide by 2
No division
Divide by 2
Table
clock. Prescaler C
PER2
Table
7-2. These bits
clock. Refer
7-3. Pres-
86