Rainbow-electronics ATmega161L Manual de usuario descargar pdf (Pagina 124)

124

ATmega161(L)

1228C–AVR–08/02

Reading the Fuse and Lock

Bits

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

the Flash” on page 120 for details on command loading):

1. A: Load Command “0000 0100”.

2. Set OE

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

DATA (“0” means programmed).

Bit 6 = BOOTRST Fuse bit

Bit 5 = SPIEN Fuse bit

Bit 4 = SUT Fuse bit

Bit 3 = “1”. This bit is reserved and must be left unprogrammed (“1”).

Bits 2 - 0 = CKSEL2..0 Fuse bits

3. Set OE

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

DATA (“0” means programmed).

Bit 5 = Boot Lock Bit12

Bit 4 = Boot Lock Bit11

Bit 3 = Boot Lock Bit02

Bit 2 = Boot Lock Bit01

Bit 1 = Lock Bit2

Bit 0 = Lock Bit1

4. Set OE

to “1”.

Reading the Signature Bytes The algorithm for reading the Signature bytes is as follows (refer to “Programming the

Flash” on page 120 for details on command and address loading):

1. A: Load Command “0000 1000”.

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

Set OE

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

3. Set OE

to “1”.

Parallel Programming

Characteristics

Figure 79. Parallel Programming Timing

Data & Control

(DATA, XA0/1, BS1)

DATA

Write

Read

XTAL1

XHXL

WLWH

DVXH

XLOL

OLDV

XLDX

PLWL

WLRH

RDY/BSY

PAGEL

PHPL

PLBX

BVXH

XLWL

RHBX

OHDZ

BVWL

WLRL

1 2 ... 119 120 121 122 123 124 125 126 127 128 129 ... 158 159

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