© 1996 Microchip Technology Inc.

Preliminary

DS11181D-page 3

93LCS56/66

TABLE 1-3:

INSTRUCTION SET FOR 93LCS56*/66

Status valid time

500

ns

CL=100 pF

Program cycle time

10

ms

ERASE/WRITE mode (Note 3)

15

ms

ERAL mode

30

ms

WRAL mode

Endurance

—

1M

—

cycles

25

°C, Vcc = 5.0V, Block Mode

(Note 4)

3: Typical program cycle time is 4 ms per word.

4: This parameter is not tested but guaranteed by characterization. For endurance estimates in a specific appli-

cation, please consult the Total Endurance Model which can be obtained on our BBS or website.

93LCS56/66 (x 16 organization)

Instruction SB Opcode

Address

Data In

Data Out

PRE

PE

Comments

READ

1

10

A7 - A0

—

D15-D0

0

X

Reads data stored in memory, start-

ing at specified address (.Note).

EWEN

1

00

11XXXXXX

—

High-Z

0

1

Erase/Write Enable must precede all

programming modes.

ERASE

1

11

A7 - A0

—

(RDY/

BSY)

1

Erase data at specified address

location if address is unprotected

(Note).

ERAL

1

00

10XXXXXX

—

(RDY/

BSY)

0

1

Erase all registers to “FF”. Valid only

when Protect Register is cleared.

WRITE

1

01

A7 - A0*

D15 - D0

(RDY/

BSY)

0

1

Writes register if address is unpro-

tected.

WRAL

1

00

01XXXXXX

D15 - D0

(RDY/

BSY)

0

1

Writes all registers. Valid only when

Protect Register is cleared.

EWDS

1

00

00XXXXXX

—

High-Z

0

X

Erase/Write Disable deactivates all

programming instructions.

PRREAD

1

10

XXXXXXXX

—

A7-A0

1

X

Reads address stored in Protect

Register.

PREN

1

00

11XXXXXX

—

High-Z

1

1

Must immediately precede

PRCLEAR, PRWRITE and PRDS

instructions.

PRCLEAR

1

11

11111111

—

(RDY/

BSY)

1

1

Clears the Protect Register such that

all data are NOT write-protected.

PRWRITE

1

01

A7 - A0*

—

(RDY/

BSY)

1

1

Programs address into Protect Reg-

ister. Thereafter, memory addresses

greater than or equal to the address

in Protect Register are write-pro-

tected.

PRDS

1

00

00000000

—

(RDY/

BSY)

1

1

ONE TIME ONLY instruction after

which the address in the Protect

Register cannot be altered.

Note:

Address A7 bit is a “don’t care” on 93LCS56.

TABLE 1-2:

DC AND AC ELECTRICAL CHARACTERISTICS

Commercial(C): Tamb = 0˚C to +70˚C

Industrial (I):

Tamb = -40˚C to +85˚C

Parameter

Symbol

Min

Max

Units

Conditions

(Continued)