ATmega168A Atmel Corporation, ATmega168A Datasheet - Page 35

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ATmega168A

Manufacturer Part Number
ATmega168A
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATmega168A

Flash (kbytes)
16 Kbytes
Pin Count
32
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
23
Ext Interrupts
24
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
9.7
9.8
8271D–AVR–05/11
128kHz Internal Oscillator
External Clock
The 128kHz internal Oscillator is a low power Oscillator providing a clock of 128kHz. The fre-
quency is nominal at 3V and 25°C. This clock may be select as the system clock by
programming the CKSEL Fuses to “11” as shown in
Table 9-13.
Note:
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 9-14.
Note:
To drive the device from an external clock source, XTAL1 should be driven as shown in
9-4. To run the device on an external clock, the CKSEL Fuses must be programmed to “0000”
(see
Table 9-15.
Figure 9-4.
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table
BOD enabled
Fast rising power
Slowly rising power
Power Conditions
Table
9-14.
9-16.
1. Note that the 128kHz oscillator is a very low power clock source, and is not designed for high
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to
9-15).
accuracy.
14CK + 4.1ms to ensure programming mode can be entered.
128kHz Internal Oscillator Operating Modes
Start-up Times for the 128kHz Internal Oscillator
Crystal Oscillator Clock Frequency
External Clock Drive Configuration
Nominal Frequency
ATmega48A/PA/88A/PA/168A/PA/328/P
Frequency
0 - 20MHz
EXTERNAL
128kHz
SIGNAL
CLOCK
Start-up Time from Power-
down and Power-save
PB7
(1)
Reserved
6 CK
6 CK
6 CK
Table
XTAL2
XTAL1
GND
9-13.
Additional Delay from
14CK + 64ms
14CK + 4ms
14CK
Reset
CKSEL3...0
CKSEL3...0
(1)
0011
0000
SUT1...0
Figure
00
01
10
11
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