ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 208

• Manufacturer Part Number: ATxmega128B1
• Manufacturer: Atmel Corporation

Specifications of ATxmega128B1

• Flash (kbytes): 128 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 53
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Segment Lcd: 160
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 16
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 4
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 8
• 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: 3
• Output Compare Channels: 10
• Input Capture Channels: 10
• Pwm Channels: 10
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

17.3.10
17.3.11
8291A–AVR–10/11
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
These bits hold the LSB of the 16-bit RTC compare value.
• Bit 7:0 – COMP[15:8]: Compare Register High
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 205
R/W
R/W
3
0
3
0
Atmel AVR XMEGA B
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
208
is