ATmega88 Atmel Corporation, ATmega88 Datasheet - Page 248

• Manufacturer Part Number: ATmega88
• Manufacturer: Atmel Corporation

Specifications of ATmega88

• Flash (kbytes): 8 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 23
• Ext Interrupts: 24
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 1
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

2545T–AVR–05/11
In Free Running mode, a new conversion will be started immediately after the conversion com-
pletes, while ADSC remains high. For a summary of conversion times, see
249.
Figure 24-4. ADC timing diagram, first conversion (single conversion mode).
Figure 24-5. ADC timing diagram, single conversion.
Figure 24-6. ADC timing diagram, auto triggered conversion.
Cycle number
ADC clock
Trigger
source
ADATE
ADIF
ADCH
ADCL
Cycle number
ADC clock
ADSC
ADIF
ADCH
ADCL
Cycle number
ADC clock
ADEN
ADSC
ADIF
ADCH
ADCL
Prescaler
reset
1
1
2
MUX and REFS
update
MUX and REFS
update
1
2
MUX and REFS
update
12
2
3
13
Sample & hold
3
4
14
Sample &
hold
4
5
15
5
6
Sample & hold
16
First conversion
6
17
7
One conversion
18
7
8
One conversion
19
8
9
20
9
10
Conversion
21
complete
10
Conversion
11
22
complete
Conversion
ATmega48/88/168
complete
11
23
12
24
12
13
25
13
Sign and MSB of result
Sign and MSB of result
LSB of result
Table 24-1 on page
Next conversion
1
Sign and MSB of result
Next
conversion
1
LSB of result
LSB of result
2
2
MUX and REFS
update
Next conversion
MUX and REFS
update
1
Prescaler
reset
3
3
2
248