AT90LS4433-4AC Atmel, AT90LS4433-4AC Datasheet - Page 95

• Manufacturer Part Number: AT90LS4433-4AC
• Description: IC MCU 4K 4MHZ A/D LV 32TQFP
• Manufacturer: Atmel
• Series: AVR® 90LSr

Specifications of AT90LS4433-4AC

• 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: 0°C ~ 70°C
• Package / Case: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Data Polling Flash
1042H–AVR–04/03
When a byte is being programmed into the Flash, reading the address location being
programmed will give the value $FF. At the time the device is ready for a new byte, the
programmed value will read correctly. This is used to determine when the next byte can
be written. This will not work for the value $FF, so when programming this value, the
user will have to wait for at least t
erased device contains $FF in all locations, programming of addresses that are meant
to contain $FF can be skipped.
Figure 67. Serial Programming Waveforms
SERIAL DATA OUTPUT
SERIAL CLOCK INPUT
SERIAL DATA INPUT
PB3(MOSI)
PB4(MISO)
PB5(SCK)
MSB
MSB
WD_PROG
before programming the next byte. As a chip-
AT90S/LS4433
LSB
LSB
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