Rainbow-electronics ATtiny28L Manual do Utilizador descarregar pdf (Página 49)

ATtiny28L/V

1062E–10/01

Reading the Fuse and Lock

Bits

The algorithm for reading the Fuse and Lock bits is as follows (refer to “Programming

the Flash” for details on command loading):

A: Load Command “0000 0100”.

1. Set OE to “0”, and BS to “0”. The status of the Fuse bits can now be read at

DATA (“0” means programmed).

Bit 4 = INTCAP Fuse

Bit 3 = CKSEL3 Fuse

Bit 2 = CKSEL2 Fuse

Bit 1 = CKSEL1 Fuse

Bit 0 = CKSEL0 Fuse

2. Set BS to “1”. The status of the Lock bits can now be read at DATA (“0” means

programmed).

Bit 2: Lock Bit2

Bit 1: Lock Bit1

3. Set OE

to “1”.

Reading the Signature Bytes

and Calibration Byte

The algorithm for reading the signature bytes and the calibration byte is as follows (refer

to “Programming the Flash” for details on command and address loading):

A: Load Command “0000 1000”.

C: Load Address Low Byte ($00 - $02).

1. Set OE

to “0”, and BS to “0”. The selected signature byte can now be read at

DATA.

C: Load Address Low Byte ($00).

1. Set OE to “0”, and BS to “1”. The calibration byte can now be read at DATA.

2. Set OE to “1”.

Figure 37. Programming the Flash Waveforms

$10 ADDR. HIGH ADDR. LOW DATA LOW

DATA

XA1

XA0

XTAL1

RDY/BSY

RESET

12V

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 74 75

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Rainbow-electronics ATtiny28L Manual do Utilizador Página 49