AT90LS8535-4AI datasheet(102/127 Pages) ATMEL

102 / 127 page

102

AT90S/LS8535

1041H–11/01

Notes:

1. a = address high bits

b = address low bits

H = 0 – Low byte, 1 – High Byte

o = data out

i = data in

x = don’t care

1 = Lock Bit 1

2 = Lock Bit 2

F = FSTRT Fuse

S = SPIEN Fuse

2. The signature bytes are not readable in lock mode 3, i.e., both Lock bits programmed.

Table 42. Serial Programming Instruction Set

Instruction

Instruction Format

Operation

Byte 1

Byte 2

Byte 3

Byte4

Programming Enable

1010 1100

0101 0011

xxxx xxxx

Enable serial programming

while RESET is low.

Chip Erase

1010 1100

100x xxxx

xxxx xxxx

Chip Erase Flash and

EEPROM memory arrays.

Read Program Memory

0010 H000

xxxx aaaa

bbbb bbbb

oooo oooo

Read H (high or low) data o

from program memory at word

address a:b.

Write Program Memory

0100 H000

xxxx aaaa

bbbb bbbb

iiii iiii

Write H (high or low) data i to

program memory at word

address a:b.

Read EEPROM Memory

1010 0000

xxxx xxxa

bbbb bbbb

oooo oooo

Read data o from EEPROM

memory at address a:b.

Write EEPROM Memory

1100 0000

xxxx xxxa

bbbb bbbb

iiii iiii

Write data i to EEPROM

memory at address a:b.

Read Lock and Fuse Bits

0101 1000

xxxx xxxx

12S

x xxxF

Read Lock and Fuse bits.

“0” = programmed

“1” = unprogrammed

Write Lock Bits

1010 1100

1111 1211

xxxx xxxx

Write Lock bits. Set bits 1,2 =

“0” to program Lock bits.

Read Signature Byte

0011 0000

xxxx xxxx

xxxx xxbb

oooo oooo

Read signature byte o at

address b.

(2)

Write FSTRT Fuse

1010 1100

1011 111F

xxxx xxxx

Write FSTRT fuse. Set bit

F = “0” to program,

“1” to unprogram.

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