ata5773 ATMEL Corporation, ata5773 Datasheet - Page 221

• Manufacturer Part Number: ata5773
• Description: Microcontroller With Uhf Ask/fsk Transmitter
• Manufacturer: ATMEL Corporation

19.7.2
19.7.3
19.7.4
8006G–AVR–01/08
Considerations for Efficient Programming
Chip Erase
Programming the Flash
Table 19-15. High-voltage Reset Characteristics
The loaded command and address are retained in the device during programming. For efficient
programming, the following should be considered.
The Chip Erase will erase the Flash and EEPROM
not reset until the Program memory has been completely erased. The Fuse bits are not
changed. A Chip Erase must be performed before the Flash and/or EEPROM are re-
programmed.
Note:
The Flash is organized in pages, see
the program data is latched into a page buffer. This allows one page of program data to be pro-
grammed simultaneously. The following procedure describes how to program the entire Flash
memory:
Supply Voltage
V
4.5V
5.5V
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.
• The command needs only be loaded once when writing or reading multiple memory
• Skip writing the data value 0xFF that is the contents of the entire EEPROM (unless the
• Address High byte needs only be loaded before programming or reading a new 256 word
1. Load command “Chip Erase” (see
2. Wait after Instr. 3 until SDO goes high for the “Chip Erase” cycle to finish.
3. Load Command “No Operation”.
CC
locations.
EESAVE Fuse is programmed) and Flash after a Chip Erase.
window in Flash or 256 byte EEPROM. This consideration also applies to Signature bytes
reading.
been applied to ensure the Prog_enable Signature has been latched.
pin.
SDI/SII.
1. The EEPROM memory is preserved during Chip Erase if the EESAVE Fuse is programmed.
CC
actually reaches 4.5 - 5.5V before giving any serial instructions on
RESET Pin High-voltage Threshold
V
11.5V
11.5V
HVRST
“Page Size” on page
Table 19-16 on page
(1)
memories plus Lock bits. The Lock bits are
162. When programming the Flash,
Minimum High-voltage Period for
172).
Latching Prog_enable
ATtiny24/44/84
100 ns
100 ns
t
HVRST
169