attiny24v ATMEL Corporation, attiny24v Datasheet - Page 168

• Manufacturer Part Number: attiny24v
• Description: 8-bit Avr Microcontroller With 2/4/8k Bytes Insystem Programmable Flash
• Manufacturer: ATMEL Corporation

19.7
19.7.1
168
High-Voltage Serial Programming Algorithm
ATtiny24/44/84
Enter High-voltage Serial Programming Mode
To program and verify the ATtiny24/44/84 in the High-voltage Serial Programming mode, the fol-
lowing sequence is recommended (See instruction formats in
The following algorithm puts the device in High-voltage Serial Programming mode:
If the rise time of the V
tive algorithm can be used:
Table 19-15. High-voltage Reset Characteristics
Supply Voltage
V
4.5V
5.5V
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 10 µs after the High-voltage has
5. Release the Prog_enable[2] pin after t
6. Wait at least 300 µs before giving any serial instructions on SDI/SII.
7. 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 10 µs after the High-voltage has
5. Release the Prog_enable[2] pin to avoid drive contention on the Prog_enable[2]/SDO
6. Wait until V
7. Exit Programming mode by power the device down or by bringing RESET pin to 0V.
CC
to 0V.
the next 20 µs.
been applied to ensure the Prog_enable Signature has been latched.
to 0V.
been applied to ensure the Prog_enable Signature has been latched.
pin.
SDI/SII.
CC
CC
, and as soon as V
actually reaches 4.5 - 5.5V before giving any serial instructions on
RESET Pin High-voltage Threshold
CC
is unable to fulfill the requirements listed above, the following alterna-
CC
CC
V
and GND. Ensure that V
and GND.
Table 19-14 on page 167
Table 19-14 on page 167
11.5V
11.5V
CC
HVRST
reaches 0.9 - 1.1V, apply 11.5 - 12.5V to RESET.
HVRST
has elapsed.
CC
Minimum High-voltage Period for
Table 19-16 on page
to “000”, RESET pin and V
to “000”, RESET pin and V
reaches at least 1.8V within
Latching Prog_enable
100 ns
100 ns
t
HVRST
8006H–AVR–10/09
171):
CC
CC