ATxmega128D4 Atmel Corporation, ATxmega128D4 Datasheet - Page 65
ATxmega128D4
Manufacturer Part Number
ATxmega128D4
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega128D4
Flash (kbytes)
128 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 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)
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
4
Output Compare Channels
14
Input Capture Channels
14
Pwm Channels
14
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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6.9.3
6.9.4
8210B–AVR–04/10
LOCK - Clock System Lock Register
RTCCTRL - RTC Control Register
• Bit 7:1 - 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 0 - LOCK: Clock System Lock
When the LOCK bit is written to one the CTRL and PSCTRL registers cannot be changed, and
the system clock selection and prescaler settings is protected against all further updates until
after the next reset. This bits are protected by the Configuration Change Protection mechanism,
for details refer to
The LOCK bit will only be cleared by a system reset.
• Bit 7:4 - 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 3:1 - RTCSRC[2:0]: Clock Source
These bits select the clock source for the Real Time Counter according to
Table 6-4.
Bit
+0x03
Read/Write
Initial Value
Bit
+0x02
Read/Write
Initial Value
RTCSRC[2:0]
000
001
010
011
100
101
110
111
7
–
R
0
R
7
–
0
RTC Clock Source
”Configuration Change Protection” on page
Group Configuration
6
–
R
0
R
6
–
0
TOSC32
RCOSC
TOSC
ULP
-
-
-
-
R
5
–
0
R
5
–
0
R
4
–
0
R
4
–
0
Description
1 kHz from internal 32 kHz ULP
1.024 kHz from 32.768 kHz Crystal Oscillator on TOSC
1.024 kHz from internal 32.768 kHz RC Oscillator
Reserved
Reserved
32.768 kHz from 32.768 kHz Crystal Oscillator on TOSC
Reserved
Reserved
R/W
3
0
R
3
–
0
RTCSRC[2:0]
R/W
2
0
R
2
–
0
12.
R/W
1
0
R
1
–
0
Table
XMEGA D
RTCEN
R/W
LOCK
0
0
R/W
6-4.
0
0
RTCCTRL
LOCK
65
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