AT90LS2323-4PI Atmel, AT90LS2323-4PI Datasheet - Page 38

• Manufacturer Part Number: AT90LS2323-4PI
• Description: IC MCU 2K FLSH 4MHZ LV IT 8DIP
• Manufacturer: Atmel
• Series: AVR® 90LSr

Specifications of AT90LS2323-4PI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 3
• 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
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -

Programming the Flash
and EEPROM
High-voltage Serial
Programming
38
AT90S/LS2323/2343
3. $002: $03 (indicates AT90S/LS2343 when signature byte $001 is $91)
Note:
Atmel’s AT90S2323/2343 offers 2K bytes of In-System Programmable Flash program
memory and 128 bytes of EEPROM data memory.
The AT90S2323/2343 is shipped with the On-chip Flash program and EEPROM data
memory arrays in the erased state (i.e., contents = $FF) and ready to be programmed.
The device supports a high-voltage (12V) Serial Programming mode and a low-voltage
Serial Programming mode. The +12V is used for programming enable only and no cur-
rent of significance is drawn by this pin. The low-voltage Serial Programming mode
provides a convenient way to download program and data into the device inside the
user’s system.
The program and EEPROM memory arrays in the AT90S2323/2343 are programmed
byte-by-byte in either programming modes. For the EEPROM, an auto-erase cycle is
provided within the self-timed write instruction in the low-voltage Serial Programming
mode.
During programming, the supply voltage must be in accordance with Table 15.
Table 15. Supply Voltage during Programming
This section describes how to program and verify Flash program memory, EEPROM
data memory, Lock bits and Fuse bits in the AT90S2323/2343.
Figure 32. High-voltage Serial Programming
Part
AT90S2323
AT90LS2323
AT90S2323
AT90LS2323
When both Lock bits are programmed (Lock mode 3), the signature bytes cannot be read
in the low-voltage Serial mode. Reading the signature bytes will return: $00, $01 and
$02.
SERIAL CLOCK INPUT
Low-voltage Serial Programming
11.5 - 12.5V
4.0 - 6.0V
2.7 - 6.0V
4.0 - 6.0V
2.7 - 6.0V
RESET
XTAL1/PB3
GND
AT90S/LS2323,
AT90S/LS2343
VCC
PB2
PB1
PB0
High-voltage Serial Programming
4.5 - 5.5V
SERIAL DATA OUTPUT
SERIAL INSTR. INPUT
SERIAL DATA INPUT
4.5 - 5.5V
4.5 - 5.5V
4.5 - 5.5V
4.5 - 5.5V
1004D–09/01