ATMEGA165-16MU Atmel, ATMEGA165-16MU Datasheet - Page 31
ATMEGA165-16MU
Manufacturer Part Number
ATMEGA165-16MU
Description
IC AVR MCU 16K 16MHZ 64-QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA165-16MU
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
54
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)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-MLF®, 64-QFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Switching Time
2573G–AVR–07/09
Table 13. Clock Prescaler Select
When switching between prescaler settings, the System Clock Prescaler ensures that
no glitches occur in the clock system and that no intermediate frequency is higher than
neither the clock frequency corresponding to the previous setting, nor the clock fre-
quency corresponding to the new setting.
The ripple counter that implements the prescaler runs at the frequency of the undivided
clock, which may be faster than the CPU’s clock frequency. Hence, it is not possible to
determine the state of the prescaler – even if it were readable, and the exact time it
takes to switch from one clock division to another cannot be exactly predicted.
From the time the CLKPS values are written, it takes between T1 + T2 and T1 + 2*T2
before the new clock frequency is active. In this interval, 2 active clock edges are pro-
duced. Here, T1 is the previous clock period, and T2 is the period corresponding to the
new prescaler setting.
CLKPS3
1
1
1
CLKPS2
1
1
1
CLKPS1
0
1
1
CLKPS0
1
0
1
ATmega165/V
Clock Division Factor
Reserved
Reserved
Reserved
31
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