Datasheet

161
8024A–AVR–04/08
ATmega8HVA/16HVA
Note: 1. a = address high bits, b = address low bits, d = data in high bits, e = data in low bits, p = data out high bits, q = data out low
bits, x = don’t care, c = Lock Bit Byte, l = fuse low byte, h = fuse high byte.
Notes: 1. For page sizes less than 256 words, parts of the address (bbbb_bbbb) will be parts of the page address.
2. For page sizes less than 256 bytes, parts of the address (bbbb_bbbb) will be parts of the page address.
Read EEPROM
Byte
SDI
SII
SDO
0_bbbb_bbbb_00
0_0000_1100_00
x_xxxx_xxxx_xx
0_aaaa_aaaa_00
0_0001_1100_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0110_1000_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0110_1100_00
q_qqqq_qqq0_00
Write Fuse High
Byte
SDI
SII
SDO
0_0100_0000_00
0_0100_1100_00
x_xxxx_xxxx_xx
0_hhhh_hhhh_00
0_0010_1100_11
x_xxxx_xxxx_xx
0_0000_0000_00
0_0111_0100_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0111_1100_00
x_xxxx_xxxx_xx
Wait after Instr. 4 until SDO goes
high. Write “0” to program the
Fuse Bits.
Write Fuse Low
Byte
SDI
SII
SDO
0_0100_0000_00
0_0100_1100_00
x_xxxx_xxxx_xx
0_IIII_IIII_00
0_0010_1100_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0110_0100_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0110_1100_00
x_xxxx_xxxx_xx
Wait after Instr. 4 until SDO goes
high. Write “0” to program the
Fuse bit.
Write Lock Bit
Byte
SDI
SII
SDO
0_0010_0000_00
0_0100_1100_00
x_xxxx_xxxx_xx
0_cccc_cccc_00
0_0010_1100_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0110_0100_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0110_1100_00
x_xxxx_xxxx_xx
Wait after Instr. 4 until SDO goes
high. Write “0” to program the
Lock Bit.
Read Fuse High
Byte
SDI
SII
SDO
0_0000_0100_00
0_0100_1100_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0111_1000_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0111_1100_0
h_hhhh_hhhx_xx
Reading “0” means the Fuse bit is
programmed.
Read Fuse Low
Byte
SDI
SII
SDO
0_0000_0100_00
0_0100_1100_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0110_1000_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0110_1100_00
I_IIII_IIIx_xx
Reading “0” means the Fuse bit is
programmed.
Read Lock Bit
Byte
SDI
SII
SDO
0_0000_0100_00
0_0100_1100_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0111_1000_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0111_1100_00
c_cccc_cccx_xx
Reading “0” means the Lock bit is
programmed.
Read Signature
Row Low Byte
SDI
SII
SDO
0_0000_1000_00
0_0100_1100_00
x_xxxx_xxxx_xx
0_bbbb_bbbb_00
0_0000_1100_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0110_1000_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0110_1100_00
q_qqqq_qqqx_xx
Repeats Instr 2 4 for each
signature low byte address.
Read Signature
Row High Byte
SDI
SII
SDO
0_0000_1000_00
0_0100_1100_00
x_xxxx_xxxx_xx
0_aaaa_aaaa_00
0_0001_1100_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0111_1000_00
x_xxxx_xxxx_xx
0_0000_0000_00
0_0111_1100_00
p_pppp_pppx_xx
Repeats Instr 2 4 for each
signature high byte address.
Load “No
Operation”
Command
SDI
SII
SDO
0_0000_0000_00
0_0100_1100_00
x_xxxx_xxxx_xx
Table 27-14. High-voltage Serial Programming Instruction Set for ATmega8HVA/16HVA (Continued)
Instruction
Instruction Format
Operation RemarksInstr.1/5 Instr.2/6 Instr.3 Instr.4