ATtiny5 Atmel Corporation, ATtiny5 Datasheet - Page 27

• Manufacturer Part Number: ATtiny5
• Manufacturer: Atmel Corporation

Specifications of ATtiny5

• Flash (kbytes): 0.5 Kbytes
• Pin Count: 6
• Max. Operating Frequency: 12 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 1
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 4
• Ext Interrupts: 4
• Usb Speed: No
• Usb Interface: No
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 4
• Adc Resolution (bits): 8
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.03
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 125
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 1
• Output Compare Channels: 2
• Input Capture Channels: 1
• Pwm Channels: 2
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

8. System Control and Reset
8.1
8.2
8127E–AVR–11/11
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
defined in section
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 start up
sequence is described in
The ATtiny4/5/9/10 have three 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
threshold (V
than the minimum pulse length
Watchdog is enabled
Pull-up Resistor
Reset Logic
POT
FILTER
Figure 8-1
SPIKE
“System and Reset Characteristics” on page
)
“Starting from Reset” on page
shows the reset logic. Electrical parameters of the reset circuitry are
Power-on Reset
VLM
Watchdog
Oscillator
Generator
Circuit
Clock
CK
Reset Flag Register
DATA BUS
(RSTFLR)
Delay Counters
20.
120.
ATtiny4/5/9/10
TIMEOUT
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