ATtiny87 Atmel Corporation, ATtiny87 Datasheet - Page 193
![no-image](/images/manufacturer_photos/0/0/79/atmel_corporation_sml.jpg)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATtiny87-A15MZ
Manufacturer:
Atmel
Quantity:
12 127
Company:
Part Number:
ATtiny87-A15SZ
Manufacturer:
Atmel
Quantity:
3 722
Company:
Part Number:
ATtiny87-A15XZ
Manufacturer:
Atmel
Quantity:
8 895
Part Number:
ATtiny87-SU
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
Company:
Part Number:
ATtiny87-SUR
Manufacturer:
Atmel
Quantity:
323
Company:
Part Number:
ATtiny87-XUR
Manufacturer:
ATMEL
Quantity:
8 272
17.3
8265B–AVR–09/10
Operation
The ADC converts an analog input voltage to a 10-bit digital value through successive approx-
imation. The minimum value represents AGND and the maximum value represents the voltage
on AV
The voltage reference for the ADC may be selected by writing to the REFS[1:0] bits in ADMUX
and AREFEN bit in AMISCR. The AV
age reference may be selected as the ADC voltage reference.
The analog input channel and differential gain are selected by writing to the MUX[4:0] bits in
ADMUX register. Any of the 11 ADC input pins ADC[10:0] can be selected as single ended
inputs to the ADC. The positive and negative inputs to the differential gain amplifier are
described in
If differential channels are selected, the differential gain stage amplifies the voltage difference
between the selected input pair by the selected gain factor 8x or 20x, according to the setting
of the MUX[4:0] bits in ADMUX register. This amplified value then becomes the analog input to
the ADC. If single ended channels are used, the gain amplifier is bypassed altogether.
The on-chip temperature sensor is selected by writing the code defined in
MUX[4:0] bits in ADMUX register when its dedicated ADC channel is used as an ADC input.
A specific ADC channel (defined in
ies of an external resistance flowing by a current driving by the Internal Current Source
(ISRC).
The ADC is enabled by setting the ADC Enable bit, ADEN in ADCSRA register. Voltage refer-
ence and input channel selections will not go into effect until ADEN is set. The ADC does not
consume power when ADEN is cleared, so it is recommended to switch off the ADC before
entering power saving sleep modes.
The ADC generates a 10-bit result which is presented in the ADC Data Registers, ADCH and
ADCL. By default, the result is presented right adjusted, but can optionally be presented left
adjusted by setting the ADLAR bit in ADMUX register.
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, to ensure that the content of the data
registers belongs to the same conversion. Once ADCL is read, ADC access to data registers
is blocked. This means that if ADCL has been read, and a conversion completes before ADCH
is read, neither register is updated and the result from the conversion is lost. When ADCH is
read, ADC access to the ADCH and ADCL Registers is re-enabled.
The ADC has its own interrupt which can be triggered when a conversion completes. When
ADC access to the data registers is prohibited between reading of ADCH and ADCL, the inter-
rupt will trigger even if the result is lost.
CC
, the voltage refrence on AREF pin or an internal 1.1V / 2.56V voltage reference.
Table
17-5.
Table
CC
supply, the AREF pin or an internal 1.1V / 2.56V volt-
17-5) is used to measure the voltage to the boundar-
Table 17-5
to the
193