AT90S8535-8AI Atmel, AT90S8535-8AI Datasheet - Page 96

• Manufacturer Part Number: AT90S8535-8AI
• Description: IC MCU 8K 8MHZ A/D IT 44TQFP
• Manufacturer: Atmel
• Series: AVR® 90Sr

Specifications of AT90S8535-8AI

• 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: 32
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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AT90S/LS8535
1. Set BS to “1”. This selects high data.
2. Give WR a negative pulse. This starts programming of the data byte. RDY/BSY
3. Wait until RDY/BSY goes high to program the next byte.
(See Figure 69 for signal waveforms.)
The loaded command and address are retained in the device during programming. For
efficient programming, the following should be considered:
• The command needs only be loaded once when writing or reading multiple memory
• Address high byte needs only be loaded before programming a new 256-word page
• Skip writing the data value $FF, that is, the contents of the entire Flash and EEPROM
These considerations also apply to EEPROM programming and Flash, EEPROM and
signature byte reading.
Figure 68. Programming the Flash Waveforms
RDY/BSY
locations.
in the Flash.
after a Chip Erase.
goes low.
RESET
XTAL1
DATA
XA1
XA0
WR
OE
BS
12V
$10
ADDR. HIGH
ADDR. LOW
DATA LOW
1041H–11/01