DOC7707 datasheet(255/307 Pages) ETC1

255 / 307 page

255

7707F–AVR–11/10

AT90USB82/162

Figure 25-6. Mapping Between BS1, BS2 and the Fuse and Lock Bits During Read

25.6.13

Reading the Signature Bytes

The algorithm for reading the Signature bytes is as follows (refer to “Programming the Flash” on

page 249 for details on Command and Address loading):

A: Load Command “0000 1000”.

B: Load Address Low Byte (0x00 - 0x02).

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

Set OE to “1”.

25.6.14

Reading the Calibration Byte

The algorithm for reading the Calibration byte is as follows (refer to “Programming the Flash” on

page 249 for details on Command and Address loading):

A: Load Command “0000 1000”.

B: Load Address Low Byte, 0x00.

Set OE to “0”, and BS1 to “1”. The Calibration byte can now be read at DATA.

Set OE to “1”.

25.6.15

Parallel Programming Characteristics

Figure 25-7. Parallel Programming Timing, Including some General Timing Requirements

Lock Bits

BS2

Fuse High Byte

BS1

DATA

Fuse Low Byte

BS2

Extended Fuse Byte

Data & Contol

(DATA, XA0/1, BS1, BS2)

XTAL1

XHXL

WLWH

DVXH

XLDX

PLWL

WLRH

RDY/BSY

PAGEL

PHPL

PLBX

BVPH

XLWL

WLBX

BVWL

WLRL

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