ATTINY88-AUR Atmel, ATTINY88-AUR Datasheet - Page 42

• Manufacturer Part Number: ATTINY88-AUR
• Description: MCU AVR 8KB FLASH 12MHZ 32TQFP
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY88-AUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 12MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 28
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8. System Control and Reset
8.1
42
Resetting the AVR
ATtiny48/88
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 an 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
shows the electrical parameters of the reset circuitry.
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
BODLEVEL [2:0]
Pull-up Resistor
Reset Logic
FILTER
SPIKE
CKSEL[1:0]
Power-on Reset
Reset Circuit
SUT[1:0]
Brown-out
Figure 8-1
Watchdog
Oscillator
Generator
Circuit
Clock
CK
shows the reset circuit.
Register (MCUSR)
MCU Status
DATA BUS
“Clock Sources” on page
Delay Counters
Table 22-3 on page 209
TIMEOUT
29.
8008G–AVR–04/11