Rainbow-electronics ATmega163L Instrukcja Użytkownika Pobierz pdf (Strona 126)

ATmega163(L)

126

Enter Programming Mode

The following algorithm puts the device in parallel programming mode:

1. Apply 4.5 - 5.5V between V

and GND.

2. Set RESET and BS pins to ‘0’ and wait at least 100 ns.

3. Apply 11.5 - 12.5V to RESET. Any activity on BS1 within 100 ns after +12V has been applied to RESET, will cause

the device to fail entering programming mode.

Chip Erase

The Chip Erase command will erase the Flash and EEPROM memories and the Lock bits. The Lock bits are 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 is reprogrammed.

Load Command “Chip Erase”

1. Set XA1, XA0 to ‘10’. This enables command loading.

2. Set BS1 to ‘0’.

3. Set DATA to ‘1000 0000’. This is the command for Chip Erase.

4. Give WR

a negative pulse. This starts the Chip Erase. RDY/BSY goes low.

5. Wait until RDY/BSY goes high before loading a new command.

Programming the Flash

The Flash is organized as 128 pages of 128 bytes each. When programming the Flash, the program data is latched into a

page buffer. This allows one page of program data to be programmed simultaneously. The following procedure describes

how to program the entire Flash memory:

A. Load Command “Write Flash”

1. Set XA1, XA0 to ‘10’. This enables command loading.

2. Set BS1 to ‘0’.

3. Set DATA to ‘0001 0000’. This is the command for Write Flash.

4. Give XTAL1 a positive pulse. This loads the command.

B. Load Address Low byte

1. Set XA1, XA0 to ‘00’. This enables address loading.

2. Set BS1 to ‘0’. This selects low address.

3. Set DATA = Address low byte ($00 - $FF).

Table 57. Command Byte Bit Coding

Command Byte Command Executed

1000 0000 Chip Erase

0100 0000 Write Fuse Bits

0010 0000 Write Lock Bits

0001 0000 Write Flash

0001 0001 Write EEPROM

0000 1000 Read Signature Bytes

0000 0100 Read Fuse and Lock Bits

0000 0010 Read Flash

0000 0011 Read EEPROM

1 2 ... 121 122 123 124 125 126 127 128 129 130 131 ... 155 156

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