ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 249

• 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

19.8
19.8.1
8291A–AVR–10/11
Register Description
CTRL – Common Control Register
• Bit 7:3 – 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 2:1 – SDAHOLD[1:0]: SDA Hold Time Enable.
of SCL.
Table 19-1.
• Bit 0 – EDIEN: External Driver Interface Enable
Setting this bit enables the use of the external driver interface, and clearing this bit enables nor-
mal two-wire mode. See
Table 19-2.
Setting these bits to one enables an internal hold time on SDA with respect to the negative edge
Bit
+0x00
Read/Write
Initial Value
SDAHOLD[1:0]
EDIEN
00
01
10
11
–
0
1
TWI
7
–
R
0
SDA hold time.
External driver interface enable.
Mode
Normal TWI
External driver interface
Group Configuration
OFF
50NS
300NS
400NS
6
–
R
0
Table 19-2 on page 249
R
5
–
0
R
4
–
0
SDA hold time off
Comment
Four-pin interface, standard I/O, no slew rate control,
and no input filter.
Description
Typical 50ns hold time
Typical 100ns hold time
Typical 400ns hold time
Two-pin interface,slew rate control, and input filter.
for details.
R
3
–
0
Atmel AVR XMEGA B
R/W
2
0
SDAHOLD[1:0]
R/W
1
0
EDIEN
R/W
0
0
CTRL
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