ATxmega128A1 Atmel Corporation, ATxmega128A1 Datasheet - Page 111
ATxmega128A1
Manufacturer Part Number
ATxmega128A1
Description
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
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10. Battery Backup System
10.1
10.2
Features
Overview
•
•
•
The Battery Backup System includes functionality that enables automatic power switching
between main power and a battery backup power.
of the system.
The Battery Backup Module supports connection of a backup battery to the dedicated V
power pin. This will ensure power to the 32-bit Real Time Counter, a 32.768 kHz crystal oscilla-
tor with failure detection monitor and two battery backup registers when the main power source
is unavailable.
Upon main power loss the device will detect this and automatically switch the Battery Backup
Module to be powered from the V
POR and BOR are released, the Battery Backup Module will automatically switch back to be
powered from main power again. The main BOD is used to detect the Vcc voltage levels, and
this must be enabled for the power switching to work.
The 32-bit Real Time Counter (RTC) must be clocked from the 1 Hz or 1.024 kHz output of a
32.768 kHz crystal oscillator connected between the TOSC1 and TOSC2 pins when running
from V
the XMEGA A Manual.
Battery Backup voltage supply from dedicated V
Automatic switching from main power to battery backup power at:
Automatic switching from battery backup power to main power:
– One Ultra Low-power 32-bit Real Time Counter
– One 32.768 kHz crystal oscillator with failure detection monitor
– Two Battery Backup Registers
– Brown-Out Detection (BOD)
– Device reset after Brown-Out Reset (BOR) is released
– Device reset after Power-On Reset (POR) and BOR is released
BAT
. For more details on the 32-bit RTC refer to the “32-bit Real Time Counter” section in
BAT
pin. After main power has been restored and both main
BAT
Figure 10-1 on page 112
power pin for:
shows an overview
BAT
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