ATmega168A

Manufacturer Part NumberATmega168A
ManufacturerAtmel Corporation
ATmega168A datasheets
 


Specifications of ATmega168A

Flash (kbytes)16 KbytesPin Count32
Max. Operating Frequency20 MHzCpu8-bit AVR
# Of Touch Channels16Hardware Qtouch AcquisitionNo
Max I/o Pins23Ext Interrupts24
Usb SpeedNoUsb InterfaceNo
Spi2Twi (i2c)1
Uart1Graphic LcdNo
Video DecoderNoCamera InterfaceNo
Adc Channels8Adc Resolution (bits)10
Adc Speed (ksps)15Analog Comparators1
Resistive Touch ScreenNoTemp. SensorYes
Crypto EngineNoSram (kbytes)1
Eeprom (bytes)512Self Program MemoryYES
Dram MemoryNoNand InterfaceNo
PicopowerNoTemp. Range (deg C)-40 to 85
I/o Supply Class1.8 to 5.5Operating Voltage (vcc)1.8 to 5.5
FpuNoMpu / Mmuno / no
Timers3Output Compare Channels6
Input Capture Channels1Pwm Channels6
32khz RtcYesCalibrated Rc OscillatorYes
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Table 28-9.
Low Fuse Byte
CKDIV8
CKOUT
SUT1
SUT0
CKSEL3
CKSEL2
CKSEL1
CKSEL0
Note:
The status of the Fuse bits is not affected by Chip Erase. Note that the Fuse bits are locked if
Lock bit1 (LB1) is programmed. Program the Fuse bits before programming the Lock bits.
28.2.1
Latching of Fuses
The fuse values are latched when the device enters programming mode and changes of the
fuse values will have no effect until the part leaves Programming mode. This does not apply to
the EESAVE Fuse which will take effect once it is programmed. The fuses are also latched on
Power-up in Normal mode.
28.3
Signature Bytes
All Atmel microcontrollers have a three-byte signature code which identifies the device. This
code can be read in both serial and parallel mode, also when the device is locked. The three
bytes reside in a separate address space. For the ATmega48A/PA/88A/PA/168A/PA/328/P the
signature bytes are given in
Table 28-10. Device ID
Part
ATmega48A
ATmega48PA
ATmega88A
ATmega88PA
ATmega168A
8271D–AVR–05/11
ATmega48A/PA/88A/PA/168A/PA/328/P
Fuse Low Byte
Bit No
Description
(4)
7
Divide clock by 8
(3)
6
Clock output
5
Select start-up time
4
Select start-up time
3
Select Clock source
2
Select Clock source
1
Select Clock source
0
Select Clock source
1. The default value of SUT1...0 results in maximum start-up time for the default clock source.
See
Table 9-12 on page 34
for details.
2. The default setting of CKSEL3...0 results in internal RC Oscillator @ 8MHz. See
page 34
for details.
3. The CKOUT Fuse allows the system clock to be output on PORTB0. See
on page 36
for details.
4. See
”System Clock Prescaler” on page 36
Table
28-10.
Signature Bytes Address
0x000
0x1E
0x1E
0x1E
0x1E
0x1E
Default Value
0 (programmed)
1 (unprogrammed)
1 (unprogrammed)
(1)
0 (programmed)
(2)
0 (programmed)
(2)
0 (programmed)
1 (unprogrammed)
(2)
0 (programmed)
Table 9-11 on
”Clock Output Buffer”
for details.
0x001
0x002
0x92
0x05
0x92
0x0A
0x93
0x0A
0x93
0x0F
0x94
0x06
(1)
(2)
301