ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 301

• Manufacturer Part Number: ATmega88PA Automotive
• Manufacturer: Atmel Corporation

28.7
28.7.1
9223B–AVR–09/11
Parallel Programming
Enter Programming Mode
Table 28-15. XA1 and XA0 Coding
Table 28-16. Command Byte Bit Coding
The following algorithm puts the device in Parallel (High-voltage) Programming mode:
Ensure that V
If the rise time of the V
tive algorithm can be used.
1. Set Prog_enable pins listed in
2. Apply 4.5 - 5.5V between V
3. Wait 20 - 60 µs, and apply 11.5 - 12.5V to RESET.
4. Keep the Prog_enable pins unchanged for at least 10µs after the High-voltage has
5. Wait at least 300 µs before giving any parallel programming commands.
6. Exit Programming mode by power the device down or by bringing RESET pin to 0V.
1. Set Prog_enable pins listed in
2. Apply 4.5 - 5.5V between V
3. Monitor V
4. Keep the Prog_enable pins unchanged for at least 10µs after the High-voltage has
5. Wait until V
6. Exit Programming mode by power the device down or by bringing RESET pin to 0V.
Command Byte
XA1
Atmel ATmega48PA/88PA/168PA [Preliminary]
0
0
1
1
1000 0000
0100 0000
0010 0000
0001 0000
0001 0001
0000 1000
0000 0100
0000 0010
0000 0011
and V
been applied to ensure the Prog_enable Signature has been latched.
and V
been applied to ensure the Prog_enable Signature has been latched.
commands.
CC
CC
XA0
CC
to 0V.
to 0V.
0
1
0
1
CC
reaches at least 1.8V within the next 20 µs.
CC
, and as soon as V
actually reaches 4.5 -5.5V before giving any parallel programming
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
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
CC
is unable to fulfill the requirements listed above, the following alterna-
CC
CC
and GND.
and GND.
Table 28-14 on page 300
Table 28-14 on page 300
CC
reaches 0.9 - 1.1V, apply 11.5 - 12.5V to RESET.
to “0000”, RESET pin to 0V
to “0000”, RESET pin to 0V
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