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ATMEGA640 Datasheet(PDF) 286 Page - Microchip Technology

Part # ATMEGA640
Description  8-bit Microcontroller with 16/32/64KB In-System Programmable Flash
PDF  436 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ATMEGA640 Datasheet(HTML) 286 Page - Microchip Technology

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]
DS40002211A
26.8.4
ADCL and ADCH – The ADC Data Register
26.8.4.1
ADLAR = 0
26.8.4.2
ADLAR = 1
When an ADC conversion is complete, the result is found in these two registers. If differential 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. Consequently, if the result is left
adjusted and no more than 8-bit precision (7 bit + sign bit for differential input channels) 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.
• ADC9:0: ADC Conversion Result
These bits represent the result from the conversion, as detailed in “ADC Conversion Result” on page 280.
Bit
151413
1211
10
9
8
(0x79)
–
–
–
–
–
–
ADC9
ADC8
ADCH
(0x78)
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADC1
ADC0
ADCL
76
54
32
10
Read/Write
RRR
RR
RR
R
RRR
RR
RR
R
Initial Value
0
0
0
0
0
0
0
0
00
00
00
00
Bit
151413
1211
10
9
8
(0x79)
ADC9
ADC8
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADCH
(0x78)
ADC1
ADC0
–
–
–
–
–
–
ADCL
76
54
32
10
Read/Write
RRR
RR
RR
R
RRR
RR
RR
R
Initial Value
0
0
0
0
0
0
0
0
00
00
00
00



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