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ATmega16 bảng dữ liệu(PDF) 88 Page - ATMEL Corporation

tên linh kiện ATmega16
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 16K Bytes In-Syustem Programmable Flash
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ATmega16 bảng dữ liệu(HTML) 88 Page - ATMEL Corporation

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2466S–AVR–05/09
ATmega16(L)
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
clk_I/O/2.5.
An external clock source can not be prescaled.
Figure 39. Prescaler for Timer/Counter0 and Timer/Counter1
(1)
Note:
1. The synchronization logic on the input pins (
T1/T0) is shown in Figure 38.
Special Function IO
Register – SFIOR
• Bit 0 – PSR10: Prescaler Reset Timer/Counter1 and Timer/Counter0
When this bit is written to one, the Timer/Counter1 and Timer/Counter0 prescaler will be reset.
The bit will be cleared by hardware after the operation is performed. Writing a zero to this bit will
have no effect. Note that Timer/Counter1 and Timer/Counter0 share the same prescaler and a
reset of this prescaler will affect both timers. This bit will always be read as zero.
PSR10
Clear
clk
T1
clk
T0
T1
T0
clk
I/O
Synchronization
Synchronization
Bit
7
6
5
4
3
2
1
0
ADTS2
ADTS1
ADTS0
–
ACME
PUD
PSR2
PSR10
SFIOR
Read/Write
R/W
R/W
R/W
R
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0



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