ATtiny15L
55
Note: 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
3 = CKSEL0 Fuse
4 = CKSEL1 Fuse
5 = RSTDISBL Fuse
6 = SPIEN Fuse
7 = BODEN Fuse
8 = BODLEVEL Fuse
Table 26. Low-voltage Serial Programming Instruction Set
Instruction Instruction Format Operation
Byte 1 Byte 2 Byte 3 Byte4
Programming Enable
1010 1100 0101 0011 xxxx xxxx xxxx xxxx Enable Serial Programming while
RESET
is low.
Chip Erase
1010 1100 100x xxxx xxxx xxxx xxxx xxxx Chip Erase Flash and EEPROM
memory arrays.
Read Program Memory
0010 H000 xxxx xxxa 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 xxxa 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 xxxx xxbb bbbb oooo oooo Read data o from EEPROM memory
at address b.
Write EEPROM
Memory
1100 0000 xxxx xxxx xxbb bbbb iiii iiii Write data i to EEPROM memory at
address b.
Write Lock Bits
1010 1100 1111 1211 xxxx xxxx xxxx xxxx Write Lock bits. Set bits 1,2 ="0" to
program Lock bits.
Read Lock Bits
0101 1000 xxxx xxxx xxxx xxxx xxxx x21x Read Lock bits. “0” = programmed,
“1” = unprogrammed.
Read Signature Bytes 0011 0000 xxxx xxxx 0000 00bb oooo oooo Read Signature Byte o at address b.
Write Fuse Bits
1010 1100 101x xxxx xxxx xxxx 8765 1143 Set bits 8 - 3 = “0” to program, “1” to
unprogram.
Read Fuse Bits
0101 0000 xxxx xxxx xxxx xxxx 8765 xx43 Read Fuse bits. “0” = programmed,
“1” = unprogrammed.
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