PCIF0 datasheet(248/294 Pages) ATMEL

248 / 294 page

248

9219A–RFID–01/11

Atmel ATA5505 [Preliminary]

22.7.12

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 243 for details on Command loading):

A: Load Command “0000 0100

b”.

Set OE to “0”, BS2 to “0” and BS1 to “0”. The status of the Fuse Low bits can now be

read at DATA (“0” means programmed).

Set OE to “0”, BS2 to “1” and BS1 to “1”. The status of the Fuse High bits can now be

read at DATA (“0” means programmed).

Set OE to “0”, BS2 to “1”, and BS1 to “0”. The status of the Extended Fuse bits can

now be read at DATA (“0” means programmed).

Set OE to “0”, BS2 to “0” and BS1 to “1”. The status of the Lock bits can now be read

at DATA (“0” means programmed).

Set OE to “1”.

Figure 22-6. Mapping Between BS1, BS2 and the Fuse and Lock Bits During Read

22.7.13

Reading the Signature Bytes

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

on page 243 for details on Command and Address loading):

A: Load Command “0000 1000

b”.

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”.

22.7.14

Reading the 8 MHz RC Oscillator Calibration Byte

The algorithm for reading the 8 MHz RC Oscillator Calibration byte is as follows (refer to “Pro-

gramming the Flash” on page 243 for details on Command and Address loading):

A: Load Command “0000 1000

b”.

B: Load Address Low Byte, 0x00.

Set OE to “0”, and BS1 to “1”. The 8 MHz RC Oscillator Calibration byte can now be

read at DATA.

Set OE to “1”.

BS2

DATA

BS2

Extended Fuse Byte

Fuse Low Byte

Fuse High Byte

Lock Bits

BS1

PCIF0 Folha de dados(PDF) 248 Page - ATMEL Corporation

PCIF0 Folha de dados(HTML) 248 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Folha de dados Download

Ligação URL