ATxmega64A4U Atmel Corporation, ATxmega64A4U Datasheet - Page 92
ATxmega64A4U
Manufacturer Part Number
ATxmega64A4U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega64A4U
Flash (kbytes)
64 Kbytes
Pin Count
44
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
34
Ext Interrupts
34
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
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)
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
5
Output Compare Channels
16
Input Capture Channels
16
Pwm Channels
16
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega64A4U-AU
Manufacturer:
ON
Quantity:
29 000
Company:
Part Number:
ATxmega64A4U-U
Manufacturer:
ATMEL
Quantity:
74
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7.9.3
7.9.4
8331A–AVR–07/11
LOCK – Clock System Lock Register
RTCCTRL – RTC Control Register
• Bit 7:1 – Reserved
These bits are reserved and will always be read as zero. For compatibility with future devices,
always write these bits to zero when this register is written.
• Bit 0 – LOCK: Clock System Lock
When this bit is written to one, the CTRL and PSCTRL registers cannot be changed, and the
system clock selection and prescaler settings are protected against all further updates until after
the next reset. This bit is protected by the configuration change protection mechanism., For
details, refer to
The LOCK bit can be cleared only by a reset.
• Bit 7:4 – 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 3:1 – RTCSRC[2:0]: RTC Clock Source
These bits select the clock source for the real-time counter according to
Table 7-4.
Bit
+0x03
Read/Write
Initial Value
Bit
+0x02
Read/Write
Initial Value
RTCSRC[2:0]
000
001
010
011
100
101
110
111
7
–
R
0
R
7
–
0
RTC clock source selection.
”Configuration Change Protection” on page
Group Configuration
6
–
R
0
R
6
–
0
RCOSC32
EXTCLK
TOSC32
RCOSC
TOSC
ULP
—
—
R
5
–
0
R
5
–
0
R
4
–
0
R
4
–
0
Description
1kHz from 32kHz internal ULP oscillator
1.024kHz from 32.768kHz crystal oscillator on TOSC
1.024kHz from 32.768kHz internal oscillator
Reserved
Reserved
32.768kHz from 32.768kHz crystal oscillator on TOSC
32.768kHz from 32.768kHz internal oscillator
External clock from TOSC1
R/W
3
0
Atmel AVR XMEGA AU
R
3
–
0
RTCSRC[2:0]
12.
R/W
2
0
R
2
–
0
R/W
1
0
R
1
–
0
Table
RTCEN
7-4.
R/W
LOCK
0
0
R/W
0
0
RTCCTRL
LOCK
92
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