AT90LS4433-4PI Atmel, AT90LS4433-4PI Datasheet - Page 24

• Manufacturer Part Number: AT90LS4433-4PI
• Description: IC MCU 4K FLSH 4MHZ A/D LV 28DIP
• Manufacturer: Atmel
• Series: AVR® 90LSr

Specifications of AT90LS4433-4PI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 20
• Program Memory Size: 4KB (2K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 6 V
• Data Converters: A/D 6x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

External Reset
24
AT90S/LS4433
Figure 25. MCU Start-up, RESET Tied to V
Figure 26. MCU Start-up, RESET Controlled Externally
An External Reset is generated by a low level on the RESET pin. Reset pulses longer
than 50 ns will generate a Reset, even if the clock is not running. Shorter pulses are not
guaranteed to generate a Reset. When the applied signal reaches the Reset Threshold
Voltage (V
period (t
Figure 27. External Reset during Operation
INTERNAL
INTERNAL
TIME-OUT
TIME-OUT
RESET
RESET
RESET
RESET
TOUT
VCC
VCC
RST
) has expired.
) on its positive edge, the delay timer starts the MCU after the Time-out
V
V
V
POT
POT
RST
t
TOUT
V
RST
CC
t
TOUT
1042H–AVR–04/03