ATtiny87 Atmel Corporation, ATtiny87 Datasheet - Page 208
ATtiny87
Manufacturer Part Number
ATtiny87
Description
Manufacturer
Atmel Corporation
Specifications of ATtiny87
Flash (kbytes)
8 Kbytes
Pin Count
20
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
16
Ext Interrupts
16
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Lin
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
0.5
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
2
Output Compare Channels
3
Input Capture Channels
1
Pwm Channels
9
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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17.11.3
17.11.3.1
17.11.3.2
208
ATtiny87/ATtiny167
ADCL and ADCH – ADC Data Register
ADLAR = 0
ADLAR = 1
Table 17-6.
When an ADC conversion is complete, the result is found in these two registers.
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 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.
• ADC[9:0]: ADC Conversion Result
These bits represent the result from the conversion, as detailed in
on page
Bit
(0x79)
(0x78)
Read/Write
Initial Value
Bit
(0x79)
(0x78)
Read/Write
Initial Value
ADPS2
1
1
1
1
202.
ADC Prescaler Selections (Continued)
ADC7
ADC9
ADC1
15
15
R
R
R
R
–
7
0
0
7
0
0
ADPS1
ADC6
ADC8
ADC0
0
0
1
1
14
14
R
R
R
R
–
6
0
0
6
0
0
ADC5
ADC7
13
13
R
R
R
R
–
5
0
0
–
5
0
0
ADPS0
0
1
0
1
ADC4
ADC6
12
12
R
R
R
R
–
4
0
0
–
4
0
0
ADC3
ADC5
11
11
R
R
R
R
–
3
0
0
–
3
0
0
ADC2
ADC4
10
10
R
R
R
R
–
2
0
0
–
2
0
0
Division Factor
“ADC Conversion Result”
ADC9
ADC1
ADC3
R
R
R
R
9
1
0
0
9
–
1
0
0
128
16
32
64
ADC8
ADC0
ADC2
R
R
R
R
8
0
0
0
8
–
0
0
0
8265B–AVR–09/10
ADCH
ADCH
ADCL
ADCL
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