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ATMEGA16 датащи(PDF) 214 Page - ATMEL Corporation

номер детали ATMEGA16
подробное описание детали  8-bit AVR Microcontroller with 16K Bytes In-System Programmable Flash
PDF  315 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
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ATMEGA16 датащи(HTML) 214 Page - ATMEL Corporation

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214
ATmega16(L)
2466E–AVR–10/02
• Bits 2:0 – ADPS2:0: ADC Prescaler Select Bits
These bits determine the division factor between the XTAL frequency and the input
clock to the ADC.
The ADC Data Register –
ADCL and ADCH
ADLAR = 0
ADLAR = 1
When an ADC conversion is complete, the result is found in these two registers. If differ-
ential channels are used, the result is presented in two’s complement form.
When ADCL is read, the ADC Data Register is not updated until ADCH is read. Conse-
quently, if the result is left adjusted and no more than 8-bit precision is required, it is
sufficient to read ADCH. Otherwise, ADCL must be read first, then ADCH.
The ADLAR bit in ADMUX, and the MUXn bits in ADMUX affect the way the result is
read from the registers. If ADLAR is set, the result is left adjusted. If ADLAR is cleared
(default), the result is right adjusted.
Table 84. ADC Prescaler Selections
ADPS2
ADPS1
ADPS0
Division Factor
000
2
001
2
010
4
011
8
100
16
101
32
110
64
111
128
Bit
151413
12
11
10
9
8
–––––
–
ADC9
ADC8
ADCH
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADC1
ADC0
ADCL
76543
210
Read/Write
RRRRRRR
R
RRRRRRR
R
Initial Value
00000
000
00000
000
Bit
151413
12
11
10
9
8
ADC9
ADC8
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADCH
ADC1
ADC0
–
–
–
–
–
–
ADCL
76543
210
Read/Write
RRRRRRR
R
RRRRRRR
R
Initial Value
00000
000
00000
000



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