Rainbow-electronics ATtiny43U Manuel d'utilisateur télécharger pdf (Page 144)

144

8048B–AVR–03/09

ATtiny43U

The XA1/XA0 pins determine the action executed when the CLKI pin is given a positive pulse.

The bit coding is shown in Table 19-12.

When pulsing WR

or OE, the command loaded determines the action executed. The different

Commands are shown in Table 19-13.

19.6 Parallel Programming

19.6.1 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

to “0” and toggle CLKI at least six times.

3. Set the Prog_enable pins listed in Table 19-11 on page 143 to “0000” and wait at least

100 ns.

4. Apply 11.5 - 12.5V to RESET

. Any activity on Prog_enable pins within 100 ns after

+12V has been applied to RESET

, will cause the device to fail entering programming

mode.

5. Wait at least 50 µs before sending a new command.

19.6.2 Considerations for Efficient Programming

The loaded command and address are retained in the device during programming. For efficient

programming, the following should be considered.

Table 19-12. XA1 and XA0 Coding

XA1 XA0 Action when CLKI is Pulsed

0 0 Load Flash or EEPROM Address (High or low address byte determined by BS1).

0 1 Load Data (High or Low data byte for Flash determined by BS1).

1 0 Load Command

1 1 No Action, Idle

Table 19-13. 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 and Calibration byte

0000 0100 Read Fuse and Lock bits

0000 0010 Read Flash

0000 0011 Read EEPROM

1 2 ... 139 140 141 142 143 144 145 146 147 148 149 ... 181 182

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Rainbow-electronics ATtiny43U Manuel d'utilisateur Page 144

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