ATTINY13A-SHR Atmel, ATTINY13A-SHR Datasheet - Page 35

• Manufacturer Part Number: ATTINY13A-SHR
• Description: MCU AVR 1KB FLASH 20MHZ 8SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY13A-SHR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 6
• Program Memory Size: 1KB (512 x 16)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 64 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Package: 8SOIC EIAJ
• Device Core: AVR
• Family Name: ATtiny
• Maximum Speed: 20 MHz
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 6
• Interface Type: SPI
• On-chip Adc: 4-chx10-bit
• Number Of Timers: 1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Connectivity: -
• Lead Free Status / Rohs Status: Details

8. System Control and Reset
8.1
8126E–AVR–07/10
Resetting the AVR
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 Characteristics” on page 120
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 differ-
ent selections for the delay period are presented in
BODLEVEL[1:0]
Pull-up Resistor
Reset Logic
FILTER
SPIKE
CKSEL[1:0]
Power-on Reset
Reset Circuit
SUT[1:0]
Brown-out
Watchdog
Oscillator
Generator
Figure 8-1 on page 35
Circuit
Clock
defines the electrical parameters of the reset circuitry.
CK
Register (MCUSR)
MCU Status
DATA BUS
“Clock Sources” on page
Delay Counters
shows the reset logic.
TIMEOUT
24.
“System and
35