AT90S2333-8AC Atmel, AT90S2333-8AC Datasheet - Page 80

• Manufacturer Part Number: AT90S2333-8AC
• Description: IC MCU 2K FLSH 8MHZ A/D 32TQFP
• Manufacturer: Atmel
• Series: AVR® 90Sr

Specifications of AT90S2333-8AC

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 20
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Data Polling EEPROM
When a byte is being programmed into the EEPROM, reading the address location being programmed will give the value
P1 until the auto-erase is finished, and then the value P2. See Table 34 for P1 and P2 values.
At the time the device is ready for a new EEPROM byte, the programmed value will read correctly. This is used to deter-
mine when the next byte can be written. This will not work for the values P1 and P2, so when programming these values,
the user will have to wait for at least the prescribed time
t
$FF, can be skipped. This does not apply if the EEPROM is reprogrammed without first chip-erasing the device.
Table 34. Read Back Value during EEPROM polling
Data Polling Flash
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
addresses that are meant to contain $FF, can be skipped.
Figure 67. Serial Programming Waveforms
80
WD_PROG
Part
AT90S/LS2333
AT90S/LS4433
SERIAL DATA OUTPUT
value. As a chip-erased device contains $FF in all locations, programming of addresses that are meant to contain
WD_PROG
SERIAL CLOCK INPUT
SERIAL DATA INPUT
AT90S/LS2333 and AT90S/LS4433
before programming the next byte. As a chip-erased device contains $FF in all locations, programming of
PB3(MOSI)
PB4(MISO)
PB5(SCK)
MSB
MSB
P1
$00
$00
t
WD_PROG
before programming the next byte. See Table 38 for
P2
$FF
$FF
LSB
LSB