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ATtiny43U Datasheet(PDF) 149 Page - ATMEL Corporation

Part # ATtiny43U
Description  8-bit Microcontroller with 4K Bytes In-System Programmable Flash and Boost Converter
PDF  182 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATtiny43U Datasheet(HTML) 149 Page - ATMEL Corporation

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149
8048B–AVR–03/09
19.6.8
Programming the Fuse Low Bits
The algorithm for programming the Fuse Low bits is as follows (refer to “Programming the Flash”
on page 145 for details on Command and Data loading):
1.
A: Load Command “0100 0000”.
2.
C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.
3.
Give WR a negative pulse and wait for RDY/BSY to go high.
19.6.9
Programming the Fuse High Bits
The algorithm for programming the Fuse High bits is as follows (refer to “Programming the
Flash” on page 145 for details on Command and Data loading):
1.
A: Load Command “0100 0000”.
2.
C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.
3.
Set BS1 to “1” and BS2 to “0”. This selects high data byte.
4.
Give WR a negative pulse and wait for RDY/BSY to go high.
5.
Set BS1 to “0”. This selects low data byte.
19.6.10
Programming the Extended Fuse Bits
The algorithm for programming the Extended Fuse bits is as follows (refer to “Programming the
Flash” on page 145 for details on Command and Data loading):
1.
1. A: Load Command “0100 0000”.
2.
2. C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.
3.
3. Set BS1 to “0” and BS2 to “1”. This selects extended data byte.
4.
4. Give WR a negative pulse and wait for RDY/BSY to go high.
5.
5. Set BS2 to “0”. This selects low data byte.
Figure 19-5. Programming the FUSES Waveforms
19.6.11
Programming the Lock Bits
The algorithm for programming the Lock bits is as follows (refer to “Programming the Flash” on
page 145 for details on Command and Data loading):
RDY/BSY
WR
OE
RESET +12V
0x40
DATA
DATA
XX
XA1/BS2
XA0
PAGEL/BS1
CLKI
AC
0x40
DATA
XX
AC
Write Fuse Low byte
Write Fuse high byte
0x40
DATA
XX
AC
Write Extended Fuse byte



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