ATxmega64A4U Atmel Corporation, ATxmega64A4U Datasheet - Page 221
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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18.3.10
18.3.11
8331A–AVR–07/11
COMPL – Compare Register Low
COMPH – Compare Register High
The COMPH and COMPL register pair represent the 16-bit value, COMP. COMP is constantly
compared with the counter value (CNT). A compare match will set COMPIF in the INTFLAGS
register. Reading and writing 16-bit values requires special attention. Refer
Registers” on page 12
Due to synchronization between the RTC clock and system clock domains, there is a latency of
two RTC clock cycles from updating the register until this has an effect. Application software
needs to check that the SYNCBUSY flag in the
cleared before writing to this register.
If the COMP value is higher than the PER value, no RTC compare match interrupt requests or
events will ever be generated.
• Bit 7:0 – COMP[7:0]: Compare Register Low Byte
These bits hold the LSB of the 16-bit RTC compare value.
• Bit 7:0 – COMP[15:8]: Compare Register High Byte
These bits hold the MSB of the 16-bit RTC compare value.
Bit
+0x0C
Read/Write
Initial Value
Bit
+0x0D
Read/Write
Initial Value
R/W
R/W
7
0
7
0
for details.
R/W
R/W
6
0
6
0
R/W
R/W
5
0
5
0
R/W
R/W
4
0
4
0
COMP[15:8]
COMP[7:0]
”STATUS – Status Register” on page 218
R/W
R/W
Atmel AVR XMEGA AU
3
0
3
0
R/W
R/W
2
0
2
0
R/W
R/W
1
0
1
0
”Accessing 16-bit
R/W
R/W
0
0
0
0
COMPH
COMPL
221
is
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