Rainbow-electronics ATmega64M1 Manual de usuario descargar pdf (Pagina 296)

296

8209A–AVR–08/09

ATmega16M1/32M1/64M1

28.8 Serial Programming Pin Mapping

28.9 Parallel Programming

28.9.1 Enter Programming Mode

The following algorithm puts the device in Parallel (High-voltage) > Programming mode:

1. Set Prog_enable pins listed in Table 28-12. to “0000”, RESET pin to “0” and Vcc to 0V.

2. Apply 4.5 - 5.5V between VCC and GND. Ensure that Vcc reaches at least 1.8V within

the next 20µs.

3. Wait 20 - 60µs, and apply 11.5 - 12.5V to RESET.

4. Keep the Prog_enable pins unchanged for at least 10µs after the High-voltage has

been applied to ensure the Prog_enable Signature has been latched.

5. Wait at least 300µs before giving any parallel programming commands.

6. Exit Programming mode by power the device down or by bringing RESET pin to 0V.

Table 28-13. XA1 and XA0 Coding

XA1 XA0 Action when XTAL1 is Pulsed

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 28-14. 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

Table 28-15. Pin Mapping Serial Programming

Symbol Pins I/O Description

MOSI_A PD3 I Serial Data in

MISO_A PD2 O Serial Data out

SCK_A PD4 I Serial Clock

1 2 ... 291 292 293 294 295 296 297 298 299 300 301 ... 342 343

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Rainbow-electronics ATmega64M1 Manual de usuario Pagina 296