Rainbow-electronics AT90LS4433 Manual de usuario descargar pdf (Pagina 87)

AT90S/LS4433

1042G–AVR–09/02

Enter Programming Mode The following algorithm puts the device in Parallel Programming mode:

1. Apply supply voltage according to Table 29, between V

and GND.

2. Set the RESET

and BS pin to “0” and wait at least 100 ns.

3. Apply 11.5 - 12.5V to RESET

. Any activity on BS within 100 ns after +12V has

been applied to RESET

will cause the device to fail entering Programming mode.

Table 30. Pin Name Mapping

Signal Name in

Programming Mode Pin Name I/O Function

RDY/BSY

PD1 O

0: Device is busy programming, 1: Device is

ready for new command

PD2 I Output Enable (active low)

PD3 I WritePulse(activelow)

BS PD4 I

Byte Select (“0” selects Low Byte, “1”

selects High Byte)

XA0 PD5 I XTAL Action Bit 0

XA1 PD6 I XTAL Action Bit 1

DATA PC1 - 0, PB5 - 0 I/O

Bi-directional Data Bus (output when OE

low)

Table 31. XA1 and XA0 Coding

XA1 XA0 Action when XTAL1 is Pulsed

0 0 Load Flash or EEPROM Address (high or low address byte determined by BS)

0 1 Load Data (high or low data byte for Flash determined by BS)

1 0 Load Command

1 1 No Action, Idle

Table 32. 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 ... 82 83 84 85 86 87 88 89 90 91 92 ... 124 125

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Rainbow-electronics AT90LS4433 Manual de usuario Pagina 87

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