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EXAMPLE: Programming Cycle of Six Words and Programming Into EEPROM

EnterProgrammingSequence

Word0

After8bits,thepayload

dataistransferredto

theRAMandisactive.

Waitforatleast

10msbefore

exitingEEPROM

writephase,for

safeoperation.

Payload

Word1

Payload

Word5

Payload

State

Machine

Jump

State

Machine

Jump

State2

State3

®

State3

State1

®

T0043-03

·

·

·

·

·

·

Enter Register Readback Mode and Related Timing Diagram

CDCE421

SCAS842 – APRIL 2007

The following sequence shows how to enter programming mode and how the different words can be written. The

addressing of Word0

… Word5 is shown in bold. After the word address, the payload for the respective word is

clocked in. In this example, this is followed by a jump from State 2

→ State 3 into enter EEPROM programming

with EEPROM lock. In the EEPROM-programming state, it is necessary to wait at least 10 ms for safe

programming. The last command is a jump from State 3 into State 1 (normal operation). Cycle power and verify

that the device functions as programmed.

Figure 4. Programming Cycle of Six Words and Programming Into EEPROM

Similar to the enter programming mode sequence, the enter register read back mode is written into SDATA.

After the command has been issued, the SDATA input is reconfigured as clock input. By applying one clock, the

EEPROM content is read into shift registers. Now, by further applying clocks at SDATA, the EEPROM content

edge, the OUTP/OUTN pins are reconfigured back into normal operation.

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