ATtiny87 Atmel Corporation, ATtiny87 Datasheet - Page 24
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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
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Part Number:
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Manufacturer:
Atmel
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12 127
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Part Number:
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Manufacturer:
MICROCHIP/微芯
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20 000
Company:
Part Number:
ATtiny87-SUR
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Atmel
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Company:
Part Number:
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Manufacturer:
ATMEL
Quantity:
8 272
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4. System Clock and Clock Options
4.1
24
Clock Systems and their Distribution
ATtiny87/ATtiny167
The ATtiny87/167 provides a large number of clock sources. They can be divided into two cat-
egories: internal and external. Some external clock sources can be shared with the
asynchronous timer. After reset, the clock source is determined by the CKSEL Fuses. Once
the device is running, software clock switching is possible to any other clock sources.
Hardware controls are provided for clock switching management but some specific proce-
dures must be observed. Clock switching should be performed with caution as some settings
could result in the device having an incorrect configuration.
Figure 4-1
clocks may not need to be active at any given time. In order to reduce power consumption, the
clocks to modules not being used can be halted by using different sleep modes or by using
features of the dynamic clock switch circuit (See
page 42
Figure 4-1.
Timer/Counter0
Asynchronous
and
presents the principal clock systems in the AVR and their distribution. All of the
CKOUT
“Dynamic Clock Switch” on page
Fuse
Clock Distribution
General I/O
External Clock
Modules
clk
clk
ASY
I/O
PB4 / XTAL1 / CLKI
Multiplexer
Crystal Oscillator
Control Unit
Low-frequency
AVR Clock
ADC
clk
Source Clock
Clock Switch
ADC
Prescaler
PB5 / XTAL2 / CLKO
31). The clock systems are detailed below.
Reset Logic
“Power Management and Sleep Modes” on
CPU Core
clk
clk
CPU
FLASH
Oscillator
Crystal
Watchdog Clock
Watchdog
Oscillator
Watchdog Timer
RAM
Calibrated RC
Flash and
EEPROM
Oscillator
8265B–AVR–09/10
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