ATxmega64A4U Atmel Corporation, ATxmega64A4U Datasheet - Page 219

• Manufacturer Part Number: ATxmega64A4U
• 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

18.3.4
18.3.5
18.3.6
8331A–AVR–07/11
INTFLAGS - Interrupt Flag Register
TEMP – Temporary Register
CNTL – Counter Register Low
• Bit 7:2 – 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 1 – COMPIF: Compare Match Interrupt Flag
This flag is set on the next count after a compare match condition occurs. It is cleared automati-
cally when the RTC compare match interrupt vector is executed. The flag can also be cleared by
writing a one to its bit location.
• Bit 0 – OVFIF: Overflow Interrupt Flag
This flag is set on the next count after an overflow condition occurs. It is cleared automatically
when the RTC overflow interrupt vector is executed. The flag can also be cleared by writing a
one to its bit location.
• Bit 7:0 – TEMP[7:0]: Real-Time Counter Temporary Register
This register is used for 16-bit access to the counter value, compare value, and TOP value reg-
isters. The low byte of the 16-bit register is stored here when it is written by the CPU. The high
byte of the 16-bit register is stored when the low byte is read by the CPU. For more details, refer
to
The CNTH and CNTL register pair represents the 16-bit value, CNT. CNT counts positive clock
edges on the prescaled RTC clock. Reading and writing 16-bit values requires special attention.
Refer to
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.
Bit
+0x03
Read/Write
Initial Value
Bit
+0x04
Read/Write
Initial Value
Bit
+0x08
Read/Write
Initial Value
”Accessing 16-bit Registers” on page
”Accessing 16-bit Registers” on page 12
R/W
R/W
R
7
–
0
7
0
7
0
R/W
R/W
R
6
–
0
6
0
6
0
R/W
R/W
R
5
–
0
5
0
5
0
12.
R/W
R/W
R
4
–
0
4
0
4
0
TEMP[7:0]
CNT[7:0]
for details.
”STATUS – Status Register” on page 218
R/W
R/W
Atmel AVR XMEGA AU
3
–
R
0
3
0
3
0
R/W
R/W
2
–
R
0
2
0
2
0
COMPIF
R/W
R/W
R/W
1
0
1
0
1
0
OVFIF
R/W
R/W
R/W
0
0
0
0
0
0
INTFLAGS
TEMP
CNTL
219
is