ATMEGA8U2_14 Datasheet, PDF (263/310 Pages) ATMEL Corporation – 125 Powerful Instructions – Most Single Clock Cycle Execution

ATmega8U2/16U2/32U2
Table 25-16. Serial Programming Instruction Set (Continued)
Instruction Format
Instruction
Byte 1
Byte 2
Byte 3
Byte4
Operation
Read Extended Fuse Bits
0101 0000
0000 1000
xxxx xxxx
oooo oooo
Read Extended Fuse bits. “0” = pro-
grammed, “1” = unprogrammed. See
Table 25-3 on page 247 for details.
Read Calibration Byte
0011 1000 000x xxxx 0000 0000 oooo oooo Read Calibration Byte
Poll RDY/BSY
1111 0000
0000 0000
xxxx xxxx
xxxx xxxo
If o = “1”, a programming operation is
still busy. Wait until this bit returns to
“0” before applying another command.
Note: a = address high bits, b = address low bits, c = address extended bits, H = 0 - Low byte, 1 - High Byte, o = data out, i = data in,
x = don’t care
25.9.2
Serial Programming Characteristics
For characteristics of the Serial Programming module see “SPI Timing Characteristics” on page
269.
7799D–AVR–11/10
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