ATxmega128D4 Atmel Corporation, ATxmega128D4 Datasheet - Page 76
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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7.3.4
7.3.5
7.4
7.5
7.5.1
8210B–AVR–04/10
Power Reduction Registers
Register Description – Sleep
Standby Mode
Extended Standby Mode
CTRL- Sleep Control Register
Standby mode is identical to Power-down with the exception that the enabled system clock
sources are kept running, while the CPU, Peripheral and RTC clocks are stopped. This reduces
the wake-up time.
Extended Standby mode is identical to Power-save mode with the exception that the enabled
system clock sources are kept running while the CPU and Peripheral clocks are stopped. This
reduces the wake-up time.
The Power Reduction (PR) registers provides a method to stop the clock to individual peripher-
als. When this is done the current state of the peripheral is frozen and the associated I/O
registers cannot be read or written. Resources used by the peripheral will remain occupied;
hence the peripheral should in most cases be disabled before stopping the clock. Enabling the
clock to a peripheral again, puts the peripheral in the same state as before it was stopped. This
can be used in Idle mode and Active mode to reduce the overall power consumption signifi-
cantly. In all other sleep modes, the peripheral clock is already stopped.
Not all devices have all the peripherals associated with a bit in the power reduction registers.
Setting a power reduction bit for a peripheral that is not available will have no effect.
• 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 - SMODE[2:0]: Sleep Mode Selection
These bits select sleep modes according to
Table 7-2.
Bit
+0x00
Read/Write
Initial Value
SMODE[2:0]
XXX
000
001
010
011
100
R
7
–
0
Sleep mode
R
6
–
0
SEN
0
1
1
1
1
1
R
5
–
0
R
4
–
0
Table 7-2 on page
Group Configuration
PDOWN
R/W
PSAVE
3
0
IDLE
OFF
-
-
SMODE[2:0]
R/W
2
0
76.
R/W
Description
No sleep mode enabled
Idle Mode
Reserved
Power-down Mode
Power-save Mode
Reserved
1
0
XMEGA D
SEN
R/W
0
0
CTRL
76
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