AT90LS2333-4AI Atmel, AT90LS2333-4AI Datasheet - Page 75

• Manufacturer Part Number: AT90LS2333-4AI
• Description: IC MCU 2K 4MHZ A/D LV IT 32TQFP
• Manufacturer: Atmel
• Series: AVR® 90LSr

Specifications of AT90LS2333-4AI

• 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: 2KB (1K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 6 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

• Address high byte needs only be loaded before programming a new 256 word page in the Flash.
• Skip writing the data value $FF, that is the contents of the entire Flash and EEPROM after a Chip Erase.
These considerations also applies to EEPROM programming, and Flash, EEPROM and Signature bytes reading.
Figure 63. Programming the Flash Waveforms
Figure 64. Programming the Flash Waveforms (continued)
Reading the Flash
The algorithm for reading the Flash memory is as follows (refer to Programming the Flash for details on Command and
Address loading):
1. A: Load Command ‘0000 0010’.
2. B: Load Address High Byte ($00 - $03/$07).
3. C: Load Address Low Byte ($00 - $FF).
4. Set OE to ‘0’, and BS to ‘0’. The Flash word low byte can now be read at DATA.
5. Set BS to ‘1’. The Flash word high byte can now be read from DATA.
6. Set OE to ‘1’.
RDY/BSY
RESET
XTAL1
DATA
XA1
XA0
WR
OE
BS
RDY/BSY
RESET
XTAL1
DATA
XA1
XA0
WR
12V
OE
BS
+12V
$10
DATA HIGH
ADDR. HIGH
ADDR. LOW
AT90S/LS2333 and AT90S/LS4433
DATA LOW
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