ATMEGA8535L-8PJ Atmel, ATMEGA8535L-8PJ Datasheet - Page 242
![IC MCU AVR 8K 5V 8MHZ 40-DIP](/photos/6/70/67049/453-40-dip_sml.jpg)
ATMEGA8535L-8PJ
Manufacturer Part Number
ATMEGA8535L-8PJ
Description
IC MCU AVR 8K 5V 8MHZ 40-DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8535L-8PJ
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, 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)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Parallel Programming
Enter Programming Mode
Considerations for Efficient
Programming
Chip Erase
242
ATmega8535(L)
The following algorithm puts the device in Parallel Programming mode:
1. Apply 4.5 - 5.5V between V
2. Set RESET to “0” and toggle XTAL1 at least six times.
3. Set the Prog_enable pins listed in Table 101 on page 241 to “0000” and wait at
4. Apply 11.5 - 12.5V to RESET. Any activity on Prog_enable pins within 100 ns
Note, if External Crystal or External RC configuration is selected, it may not be possible
to apply qualified XTAL1 pulses. In such cases, the following algorithm should be
followed:
1. Set Prog_enable pins listed in Table 101 on page 241 to “0000”.
2. Apply 4.5 - 5.5V between V
3. Wait 100 ns.
4. Re-program the fuses to ensure that External Clock is selected as clock source
5. Exit Programming mode by power the device down or by bringing RESET pin to
6. Entering Programming mode with the original algorithm, as described above.
The loaded command and address are retained in the device during programming. For
efficient programming, the following should be considered.
•
•
•
The Chip Erase will erase the Flash and EEPROM
bits are not reset until the program memory has been completely erased. The Fuse bits
are not changed. A Chip Erase must be performed before the Flash and/or the
EEPROM is reprogrammed.
Note:
Load Command “Chip Erase”
1. Set XA1, XA0 to “10”. This enables command loading.
2. Set BS1 to “0”.
3. Set DATA to “1000 0000”. This is the command for Chip Erase.
4. Give XTAL1 a positive pulse. This loads the command.
5. Give WR a negative pulse. This starts the Chip Erase. RDY/BSY goes low.
6. Wait until RDY/BSY goes high before loading a new command.
least 100 ns.
after +12V has been applied to RESET, will cause the device to fail entering Pro-
gramming mode.
applied to RESET.
(CKSEL3:0 = 0b0000) If Lock bits are programmed, a Chip Erase command
must be executed before changing the fuses.
0b0.
The command needs only be loaded once when writing or reading multiple memory
locations.
Skip writing the data value 0xFF, that is the contents of the entire EEPROM (unless
the EESAVE fuse is programmed) and Flash after a Chip Erase.
Address high byte needs only be loaded before programming or reading a new 256
word window in Flash or 256 byte EEPROM. This consideration also applies to
Signature bytes reading.
1. The EEPRPOM memory is preserved during Chip Erase if the EESAVE Fuse is
programmed.
CC
CC
and GND, and wait at least 100 µs.
and GND simultaneously as 11.5 - 12.5V is
(1)
memories plus Lock bits. The Lock
2502K–AVR–10/06
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