AT90S8535-8JI Atmel, AT90S8535-8JI Datasheet - Page 98
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AT90S8535-8JI
Manufacturer Part Number
AT90S8535-8JI
Description
IC MCU 8K 8MHZ A/D IT 44PLCC
Manufacturer
Atmel
Series
AVR® 90Sr
Specifications of AT90S8535-8JI
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-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Programming the Fuse Bits
Programming the Lock Bits
Reading the Fuse and Lock
Bits
Reading the Signature Bytes
98
AT90S/LS8535
The algorithm for programming the Fuse bits is as follows (refer to “Programming the
Flash” for details on command and data loading):
1. A: Load Command “0100 0000”.
2. D: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.
3. Give WR a
The algorithm for programming the Lock bits is as follows (refer to “Programming the
Flash” on page 95 for details on command and data loading):
1. A: Load Command “0010 0000”.
2. D: Load Data Low Byte. Bit n = “0” programs the Lock bit.
3. E: Write Data Low Byte.
The Lock bits can only be cleared by executing Chip Erase.
The algorithm for reading the Fuse and Lock bits is as follows (refer to “Programming
the Flash” on page 95 for details on command loading):
1. A: Load Command “0000 0100”.
2. Set OE to “0” and BS to “1”. The status of the Fuse and Lock bits can now be
3. Set OE to “1”.
The algorithm for reading the signature bytes is as follows (refer to “Programming the
Flash” on page 95 for details on command and address loading):
1. A: Load Command “0000 1000”.
2. C: Load Address Low Byte ($00 - $02).
3. Set OE to “1”.
Set OE to “0” and BS to “0”. The selected signature byte can now be read at DATA.
Bit 5 = SPIEN Fuse bit.
Bit 0 = FSTRT Fuse bit.
Bit 7-6,4-1 = “1”. These bits are reserved and should be left unprogrammed (“1”).
is found in Table 40. Programming the Fuse bits does not generate any activity
on the RDY/BSY pin.
Bit 2 = Lock Bit2
Bit 1 = Lock Bit1
Bit 7-3,0 = “1”. These bits are reserved and should be left unprogrammed (“1”).
read at DATA (“0” means programmed).
Bit 7 = Lock Bit1
Bit 6 = Lock Bit2
Bit 5 = SPIEN Fuse bit
Bit 0 = FSTRT Fuse bit
Observe that BS needs to be set to “1”.
t
WLWH_PFB
-wide negative pulse to execute the programming,
t
WLWH_PFB
1041H–11/01