ATxmega16D4 Atmel Corporation, ATxmega16D4 Datasheet - Page 166

• Manufacturer Part Number: ATxmega16D4
• Manufacturer: Atmel Corporation

Specifications of ATxmega16D4

• Flash (kbytes): 16 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 Speed: No
• Usb Interface: No
• Spi: 4
• Twi (i2c): 2
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 12
• Adc Speed (ksps): 200
• Analog Comparators: 2
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• 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: 4
• Output Compare Channels: 14
• Input Capture Channels: 14
• Pwm Channels: 14
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

15.3.7
15.3.8
15.3.9
8210B–AVR–04/10
CNTL - Real Time Counter Register L
PERH - Real Time Counter Period Register High
PERL - Real Time Counter Period Register L
• Bits 7:0 - CNT[15:8]: Real Time Counter value High byte
These bits hold the 8 MSB of the 16-bit Real Time Counter value.
• Bits 7:0 - CNT[7:0]: Real Time Counter value Low byte
These bits hold the 8 LSB of the 16-bit Real Time Counter value.
The PERH and PERL register pair represents the 16-bit value PER. PER is constantly com-
pared with the counter value (CNT). A match will set the OVFIF in the INTFLAGS register and
clear CNT. Reading and writing 16-bit values require special attention, refer to
bits Registers” on page 12
Due to synchronization between RTC clock and the 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
on page 164
• Bits 7:0 - PER[15:8]: Real Time Counter Period High byte
These bits hold the 8 MSB of the 16-bit RTC top value.
• Bits 7:0 - PER[7:0]: Real Time Counter Period Low byte
These bits hold the 8 LSB of the 16-bit RTC top value.
Bit
+0x0B
Read/Write
Initial Value
Bit
+0x08
Read/Write
Initial Value
Bit
+0x0A
Read/Write
Initial Value
is cleared before writing to this register.
R/W
R/W
R/W
7
1
7
0
7
1
R/W
R/W
R/W
6
1
6
0
6
1
for details.
R/W
R/W
R/W
5
0
5
1
5
1
R/W
R/W
R/W
4
0
4
1
4
1
PER[15:8]
CNT[7:0]
PER[7:0]
”STATUS - Real Time Counter Status Register”
R/W
R/W
R/W
3
0
3
1
3
1
R/W
R/W
R/W
2
0
2
1
2
1
R/W
R/W
R/W
1
0
1
1
1
1
XMEGA D
R/W
R/W
R/W
”Accessing 16-
0
0
0
1
0
1
CNTL
PERH
PERL
166