ATxmega32A4U Atmel Corporation, ATxmega32A4U Datasheet - Page 273
ATxmega32A4U
Manufacturer Part Number
ATxmega32A4U
Description
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
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21.9.3
8331A–AVR–07/11
CTRLC - TWI Master Control Register C
Table 21-3.
• Bit 1
When quick command is enabled, the corresponding interrupt flag is set immediately after the
slave acknowledges the address (read or write interrupt). At this point, software can issue either
a STOP or a repeated START condition.
• Bit 0
Setting this bit enables smart mode. When smart mode is enabled, the acknowledge action, as
set by the ACKACT bit in the CTRLC register, is sent immediately after reading the DATA
register.
• Bits 7:3
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
This bit defines the master's acknowledge behavior in master read mode. The acknowledge
action is executed when a command is written to the CMD bits. If SMEN in the CTRLB register is
set, the acknowledge action is performed when the DATA register is read.
Table 21-4
Table 21-4.
• Bit 1:0
Writing the command (CMD) bits triggers a master operation as defined by
CMD bits are strobe bits, and always read as zero. The acknowledge action is only valid in mas-
ter read mode (R). In master write mode (W), a command will only result in a repeated START or
Bit
+0x02
Read/Write
Initial Value
TIMEOUT[1:0]
–
–
–
00
01
10
11
- SMEN: Smart Mode Enable
ACKACT
–
QCEN: Quick Command Enable
ACKACT: Acknowledge Action
–
lists the acknowledge actions.
CMD[1:0]: Command
Reserved
0
1
7
–
R
0
TWI master inactive bus timeout settings.
ACKACT bit description.
Group Configuration
R
6
–
0
DISABLED
100US
200US
50US
Action
Send ACK
Send NACK
R
5
–
0
R
4
–
0
Description
Disabled, normally used for I
100µs
200µs
50µs, normally used for SMBus at 100kHz
Atmel AVR XMEGA AU
R
3
–
0
ACKACT
R/W
2
0
R/W
2
1
0
C
CMD[1:0]
Table
R/W
0
0
21-5. The
CTRLC
273
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