ATMEGA8L ATMEL [ATMEL Corporation], ATMEGA8L Datasheet - Page 223

• Manufacturer Part Number: ATMEGA8L
• Description: 8-bit AVR with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

2486M–AVR–12/03
Table 89. Pin Name Mapping (Continued)
Table 90. Pin Values used to Enter Programming Mode
Table 91. XA1 and XA0 Coding
Table 92. Command Byte Bit Coding
Signal Name in
Programming Mode
PAGEL
BS2
DATA
XA1
0
0
1
1
Command Byte
XA0
1000 0000
0100 0000
0010 0000
0001 0000
0001 0001
0000 1000
0000 0100
0000 0010
0000 0011
PAGEL
0
1
0
1
XA1
XA0
BS1
Pin
Action when XTAL1 is Pulsed
Load Flash or EEPROM Address (High or low address byte determined by
BS1)
Load Data (High or Low data byte for Flash determined by BS1)
Load Command
No Action, Idle
{PC[1:0]: PB[5:0]}
Pin Name
Command Executed
Chip Erase
Write Fuse Bits
Write Lock Bits
Write Flash
Write EEPROM
Read Signature Bytes and Calibration byte
Read Fuse and Lock Bits
Read Flash
Read EEPROM
PD7
PC2
Prog_enable[3]
Prog_enable[2]
Prog_enable[1]
Prog_enable[0]
Symbol
I/O
I/O
I
I
Function
Program memory and EEPROM Data
Page Load
Byte Select 2 (“0” selects Low byte, “1”
selects 2’nd High byte)
Bi-directional Data bus (Output when OE is
low)
ATmega8(L)
Value
0
0
0
0
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