X4643 datasheet(5/22 Pages) XICOR

5 / 22 page

X4643/5 – Preliminary Information

Characteristics subject to change without notice.

5 of 22

REV 1.26 4/30/02

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Figure 4. VTRIP Programming Sequence

VTRIP Programming

Apply 5V to VCC

Decrement VCC

RESET pin

goes active?

Measured VTRIP -

Desired VTRIP

DONE

Execute

Sequence

Reset VTRIP

Set VCC = VCC Applied =

Desired VTRIP

Execute

Sequence

Set VTRIP

New VCC Applied =

Old VCC Applied + Error

(VCC = VCC - 50mV)

Execute

Sequence

Reset VTRIP

New VCC Applied =

Old VCC Applied - Error

Error

≤ –Emax

–Emax < Error < Emax

YES

Error

≥ Emax

Emax = Maximum Allowed VTRIP Error

Control Register

The Control Register provides the user a mechanism

for changing the Block Lock and Watchdog Timer set-

tings. The Block Lock and Watchdog Timer bits are

nonvolatile and do not change when power is removed.

The Control Register is accessed at address FFFFh. It

can only be modiﬁed by performing a byte write opera-

tion directly to the address of the register and only one

data byte is allowed for each register write operation.

Prior to writing to the Control Register, the WEL and

RWEL bits must be set using a two step process, with

the whole sequence requiring 3 steps. See "Writing to

the Control Register" below.

The user must issue a stop after sending this byte to the

and WD0. The X4643/5 will not acknowledge any data

bytes written after the ﬁrst byte is entered.

The state of the Control Register can be read at any

time by performing a random read at address FFFFh.

Only one byte is read by each register read operation.

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