DS1977 Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated

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производитель

DS1977

32KB EEPROM iButton

Dallas Semiconductor -> Maxim Integrated 

Figure 5-1. Memory Function Flow Chart, Part 1

Master TX Memory

Function Command

From ROM Functions

Flow Chart (Figure 17)

0Fh

Write

N

Scratchpad

Y

Master TX

TA1 (T7:T0), TA2 (T15:T8)

Address of

Y

Password?

N

DS1977 sets Scratch-

pad Offset = (T5:T0)

and Clears (PF, AA)

DS1977 sets Scratchpad

Offset = (T5:T3,0,0,0) and

Clears (PF, AA, T2:T0)

Master TX Data Byte

to Scratchpad Offset

DS1977 sets (E5:E0)

= Scratchpad Offset

Master TX one or both

8-byte passwords

AAh

Read

N

Scratchpad

Y

Master RX

TA1 (T7:T0)

Master RX

TA2 (T15:T8)

Master RX Ending

Offset with Data

Status (E/S)

DS1977 sets Scratch-

pad Offset = (T5:T0)

Master RX Data Byte

from Scratchpad Offset

DS1977 Incre-

ments Scratch-

pad Offset

N

Y

Master

TX Reset?

N

Scratch-

pad Offset =

3Fh?

Y

Master

TX Reset?

Y

Partial

Byte Written?

N

N

Master RX CRC16 of

Command, Address Data

Master

Y

TX Reset?

DS1977 Incre-

ments Scratch-

pad Offset

N

Y

N

Scratch-

pad Offset =

3Fh?

Y

PF = 1

Master RX CRC16 of

Command, Address Data,

E/S Byte, and Data Starting

at the Target Address

Y

Master

TX Reset?

Y

Master

TX Reset?

N

Master RX "1"s

N

Master RX "1"s

Page 8

To ROM Functions

Flow Chart (Figure 17)

1/31/03

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