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Power Up Reset

Completed

SDATA = 111011

SDATA =

111 0000 0000

SDATA =

111 1111 0000

SDATA =

111 0000 0000

SDATA =

111 0101 0101

SDATA =

111 1111 1111

SDATA = 001100

SDATA =

100 xxxxxxxx

SDATA =

000 xxxxxxxx

SDATA =

010 xxxxxxxx

SDATA =

110 xxxxxxxx

SDATA =

001 xxxxxxxx

SDATA =

101 xxxxxxxx

PowerUp:

Read

EEPROM&

Configure

State1:IDLE

Normal

Operation

State2:

Programming

Mode

11Bit

Written

th

11Bit

Written

th

11Bit

Written

th

11Bit

Written

th

11Bit

Written

th

11Bit

Written

th

Write

WORD0

Write

WORD1

Write

WORD2

Write

WORD3

Write

WORD4

Write

WORD5

State4:

Programming

EEPROM

Locking

State3:

Programming

EEPROM

NoLocking

60

th

Clock Applied

State5:

ReadBack

Mode

F0016-02

CDCE421

SCAS842 – APRIL 2007

SDATA

FUNCTION

001 xxxx xxxx

101 xxxx xxxx

111 xxxx xxxx

State machine jump: All other patterns not defined as follows cause an exit to normal mode.

111 0101 0101

Jump: Enter EEPROM programming with EEPROM lock (State 2

→ State 3)

111 1111 0000

Jump: Enter EEPROM programming without EEPROM lock (State 2

→ State 4)

111 0000 0000

Jump: Exit EEPROM programming (State 3 or State 4

→ State 1)

NOTE: In States 2, 3, 4, and 5, the signal pin CE is disregarded and has no influence on power down.

Figure 2. State Flow-Diagram of Single-Pin Interface

5

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