ATxmega128A1 Atmel Corporation, ATxmega128A1 Datasheet - Page 115

• Manufacturer Part Number: ATxmega128A1
• Manufacturer: Atmel Corporation

Specifications of ATxmega128A1

• 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: 78
• Ext Interrupts: 78
• Usb Speed: No
• Usb Interface: No
• Spi: 12
• Twi (i2c): 4
• Uart: 8
• 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
• Dac Channels: 4
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 8
• Eeprom (bytes): 2048
• Self Program Memory: YES
• External Bus Interface: 1
• Dram Memory: sdram
• 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: 8
• Output Compare Channels: 24
• Input Capture Channels: 24
• Pwm Channels: 24
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

10.6.2
10.6.3
8077H–AVR–12/09
STATUS: Battery Backup Status Register
BACKUP0: Battery Backup Register 0
These bits are protected by the Configuration Change Protection mechanism, for detailed
description refer to
• Bit 7 - BBPWR: Battery Backup Power
The Power on the V
BBPWR flag will be set to one when no V
writing a one to its bit location.
• Bit [6:4] - 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- XOSCRDY: Crystal Oscillator Ready
When the 32 kHz crystal oscillator is stable and ready to be used, this flag is set. This flag can
be cleared by writing a one to its bit location.
• Bit 2 - XOSCFAIL: Crystal Oscillator Failure
If the 32 kHz crystal oscillator has had an failure, the flag will be read as one. This flag can be
cleared by applying a RESET to the battery backup module.
• Bit 1 - BBBODF: Battery Backup Brown-Out Detection Flag
This flag is read one if a Battery Backup BOD is detected when the Battery Backup Module is
powered from the V
is not valid when BBPWR is set.
• Bit 0 - BBPODF: Battery Backup Power-On Detection Flag
This flag is set if a Battery Backup Power-On is detected, i.e when power is connected to V
This flag can be cleared by writing a one to its bit location. This flag is not valid when BBPWR is
set.
Bit
+0x01
Read/Write
Reset Value
Bit
+0x02
Read/Write
Reset Value
BBPWR
R/W
R/W
7
x
7
0
”Configuration Change Protection” on page
BAT
BAT
R/W
pin is automatically checked each time the main domain is powered. The
pin. This flag can be cleared by writing a one to its bit location. This flag
6
6
-
R
0
x
5
-
R
0
R/W
5
x
4
-
R
0
R/W
BACKUP0[7:0]
4
x
XOSCRDY
BAT
R/W
3
x
pin power is detected. The flag can be cleared by
R/W
3
x
XOSCFAIL
R/W
2
x
R/W
2
x
12.
BBBODF
R/W
1
R/W
0
1
x
BBPODF
R/W
0
R/W
x
0
0
XMEGA A
BACKUP0
STATUS
115
BAT
.