ATtiny85 Atmel Corporation, ATtiny85 Datasheet - Page 41
![no-image](/images/manufacturer_photos/0/0/79/atmel_corporation_sml.jpg)
ATtiny85
Manufacturer Part Number
ATtiny85
Description
Manufacturer
Atmel Corporation
Datasheets
1.ATTINY25.pdf
(34 pages)
2.ATTINY25.pdf
(34 pages)
3.ATTINY25.pdf
(30 pages)
4.ATTINY85.pdf
(234 pages)
Specifications of ATtiny85
Flash (kbytes)
8 Kbytes
Pin Count
8
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
3
Hardware Qtouch Acquisition
No
Max I/o Pins
6
Ext Interrupts
6
Usb Speed
No
Usb Interface
No
Spi
1
Twi (i2c)
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
4
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
5
Pwm Channels
6
32khz Rtc
No
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATtiny85-15SZ
Manufacturer:
ATMEL
Quantity:
30
Company:
Part Number:
ATtiny85-20PU
Manufacturer:
CUI
Quantity:
1 000
Part Number:
ATtiny85-20SU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
ATtiny85V-10SH
Manufacturer:
Intel
Quantity:
62
Part Number:
ATtiny85V-10SU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
8. System Control and Reset
8.1
8.2
2586N–AVR–04/11
Resetting the AVR
Reset Sources
During reset, all I/O Registers are set to their initial values, and the program starts execution
from the Reset Vector. The instruction placed at the Reset Vector must be a RJMP – Relative
Jump – instruction to the reset handling routine. If the program never enables an interrupt
source, the Interrupt Vectors are not used, and regular program code can be placed at these
locations. The circuit diagram in
reset circuitry are given in
Figure 8-1.
The I/O ports of the AVR are immediately reset to their initial state when a reset source goes
active. This does not require any clock source to be running.
After all reset sources have gone inactive, a delay counter is invoked, stretching the internal
reset. This allows the power to reach a stable level before normal operation starts. The time-out
period of the delay counter is defined by the user through the SUT and CKSEL Fuses. The dif-
ferent selections for the delay period are presented in
The ATtiny25/45/85 has four sources of reset:
• Power-on Reset. The MCU is reset when the supply voltage is below the Power-on Reset
• External Reset. The MCU is reset when a low level is present on the RESET pin for longer
• Watchdog Reset. The MCU is reset when the Watchdog Timer period expires and the
• Brown-out Reset. The MCU is reset when the supply voltage V
threshold (V
than the minimum pulse length.
Watchdog is enabled.
Reset threshold (V
Reset Logic
BODLEVEL[2:0]
POT
RESET
VCC
).
BOT
Pull-up Resistor
) and the Brown-out Detector is enabled.
“System and Reset Characteristics” on page
FILTER
SPIKE
Figure 8-1
CKSEL[3:0]
Power-on Reset
Reset Circuit
Reset Circuit
SUT[1:0]
Brown-out
Watchdog
Watchdog
Oscillator
Generator
Circuit
Timer
Clock
shows the reset logic. Electrical parameters of the
CK
Register (MCUSR)
MCU Status
DATA BUS
Delay Counters
“Clock Sources” on page
CC
TIMEOUT
ATtiny25/45/85
is below the Brown-out
170.
R
S
Q
25.
41