attiny167-esxz ATMEL Corporation, attiny167-esxz Datasheet - Page 221

• Manufacturer Part Number: attiny167-esxz
• Description: 8-bit Avr 8-bit Microcontroller Microcontroller With 16k Bytes In-system Programmable Flash And Lin Controller
• Manufacturer: ATMEL Corporation

21.7
21.7.1
21.7.2
21.7.3
7728A–AUTO–07/08
Parallel Programming
Enter Programming Mode
Considerations for Efficient Programming
Chip Erase
Table 21-12. Command Byte Bit Coding
The following algorithm puts the device in parallel programming mode:
1. Apply 4.5 - 5.5V between Vcc and GND.
2. Set RESET to “0” and toggle XTAL1 at least six times.
3. Set the Prog_enable pins listed in
4. Apply 11.5 - 12.5V to RESET. Any activity on Prog_enable pins within 100 ns after +12V
5. Wait at least 50 µs before sending a new command.
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
reprogrammed.
Note:
Load Command “Chip Erase”
100 ns.
has been applied to RESET, will cause the device to fail entering programming mode.
The command needs only be loaded once when writing or reading multiple memory
locations.
Skip writing the data value 0xFF, that is the contents of the entire EEPROM (unless the
EESAVE Fuse is programmed) and Flash after a Chip Erase.
Address high byte needs only be loaded before programming or reading a new 256 word
window in Flash or 256 byte EEPROM. This consideration also applies to Signature bytes
reading.
Command Byte
1000 0000
0100 0000
0010 0000
0001 0000
0001 0001
0000 1000
0000 0100
0000 0010
0000 0011
1. The EEPRPOM memory is preserved during Chip Erase if the EESAVE Fuse is programmed.
b
b
b
b
b
b
b
b
b
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
Table 21-10 on page 220
(1)
memories plus Lock bits. The Lock bits are
to “0000
b
” and wait at least
ATtiny167
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