ATMEGA168A-MU Atmel, ATMEGA168A-MU Datasheet - Page 143
ATMEGA168A-MU
Manufacturer Part Number
ATMEGA168A-MU
Description
IC MCU AVR 16K FLASH 32QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA168A-MU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
Controller Family/series
Atmega
No. Of I/o's
23
Eeprom Memory Size
512Byte
Ram Memory Size
1KB
Cpu Speed
20MHz
Rohs Compliant
Yes
Processor Series
ATmega
Core
AVR
Data Bus Width
8 bit
Data Ram Size
1 KB
Interface Type
TWI, SPI, USART
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
23
Number Of Timers
3
Operating Supply Voltage
3.3 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Operating Temperature Range
- 40 C to + 85 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA168A-MU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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ATmega48A/48PA/88A/88PA/168A/168PA/328/328
Enabling and disabling of the clock input must be done when T1/T0 has been stable for at least
one system clock cycle, otherwise it is a risk that a false Timer/Counter clock pulse is generated.
Each half period of the external clock applied must be longer than one system clock cycle to
ensure correct sampling. The external clock must be guaranteed to have less than half the sys-
tem clock frequency (f
< f
/2) given a 50/50% duty cycle. Since the edge detector uses
ExtClk
clk_I/O
sampling, the maximum frequency of an external clock it can detect is half the sampling fre-
quency (Nyquist sampling theorem). However, due to variation of the system clock frequency
and duty cycle caused by Oscillator source (crystal, resonator, and capacitors) tolerances, it is
recommended that maximum frequency of an external clock source is less than f
/2.5.
clk_I/O
An external clock source can not be prescaled.
(1)
Figure 16-2. Prescaler for Timer/Counter0 and Timer/Counter1
clk
I/O
Clear
PSRSYNC
T0
Synchronization
T1
Synchronization
clk
clk
T1
T0
T1/T0)
Note:
1. The synchronization logic on the input pins (
is shown in
Figure
16-1.
143
8271C–AVR–08/10
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