ATtiny87 Atmel Corporation, ATtiny87 Datasheet - Page 42
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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
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5. Power Management and Sleep Modes
5.1
42
Sleep Modes
ATtiny87/ATtiny167
Sleep modes enable the application to shut down unused modules in the MCU, thereby saving
power. The AVR provides various sleep modes allowing the user to tailor the power consump-
tion to the application’s requirements.
When enabled, the Brown-out Detector (BOD) actively monitors the power supply voltage dur-
ing the sleep periods. To further save power, it is possible to disable the BOD in some sleep
modes. See
Figure 4-1 on page 24
tribution. The figure is helpful in selecting an appropriate sleep mode.
different sleep modes, their wake up sources and BOD disable ability.
Table 5-1.
Note:
To enter any of the four sleep modes, the SE bit in SMCR must be written to logic one and a
SLEEP instruction must be executed. The SM1, and SM0 bits in the SMCR Register select
which sleep mode (Idle, ADC Noise Reduction, Power-down, or Power-save) will be activated
by the SLEEP instruction. See
If an enabled interrupt occurs while the MCU is in a sleep mode, the MCU wakes up. The MCU
is then halted for four cycles in addition to the start-up time, executes the interrupt routine, and
resumes execution from the instruction following SLEEP. The contents of the Register File
and SRAM are unaltered when the device wakes up from sleep. If a reset occurs during sleep
mode, the MCU wakes up and executes from the Reset Vector.
Idle
ADC Noise
Reduction
Power-down
Power-Save
Sleep Mode
1. For INT1 and INT0, only level interrupt.
“BOD Disable” on page 43
Active Clock Domains and Wake-up Sources in the Different Sleep Modes
Active Clock Domains
presents the different clock systems in the ATtiny87/167, and their dis-
X
Table 5-2 on page 47
X
X
X
X
X
for more details.
Oscillators
X
X
X
X
X
for a summary.
X
X
X
X
(1)
(1)
(1)
Wake-up Sources
X
X
X
X
X
X
X
X
Table 5-1
X
X
X
X
8265B–AVR–09/10
X
X
X
shows the
X
X
X
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