Rainbow-electronics ATtiny28L Bedienungsanleitung PDF herunterladen (Seite 46)

ATtiny28L/V

1062E–10/01

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

1. Apply 4.5 - 5.5V between VCC 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 BS within 100 ns after +12V has

been applied to RESET

will cause the device to fail entering programming mode.

Table 22. 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 Write Pulse (active low)

BS PD4 I

Byte Select (“0” selects low byte, “1” selects

high byte)

XA0 PD5 I XTAL1 Action Bit 0

XA1 PD6 I XTAL1 Action Bit 1

DATA PB7 - PB0 I/O Bi-directional Data Bus (output when OE

is low)

Table 23. XA1 and XA0 Coding

XA1 XA0 Action when XTAL1 is Pulsed

Load Flash/Signature byte Address (High or low address byte for Flash

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 24. Command Byte Coding

Command Byte Command Executed

1000 0000 Chip Erase

0100 0000 Write Fuse Bits

0010 0000 Write Lock Bits

0001 0000 Write Flash

0000 1000 Read Signature Bytes and Calibration Byte

0000 0100 Read Fuse and Lock Bits

0000 0010 Read Flash

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Rainbow-electronics ATtiny28L Bedienungsanleitung Seite 46