MCP4261-103ESLASHST datasheet(48/88 Pages) MICROCHIP

48 / 88 page

MCP414X/416X/424X/426X

DS22059B-page 48

7.4

Continuous Commands

The device supports the ability to execute commands

continuously. While the CS pin is in the active state (VIL

or VIHH). Any sequence of valid commands may be

received.

The following example is a valid sequence of events:

CS pin driven active (VIL or VIHH).

Read Command.

Increment Command (Wiper 0).

Decrement Command (Wiper 1).

Write Command (Volatile memory).

Write Command (Non-Volatile memory).

CS pin driven inactive (VIH).

TABLE 7-3:

COMMANDS

Note 1:

It is recommended that while the CS pin is

active, only one type of command should

be issued. When changing commands, it

is recommended to take the CS pin

inactive then force it back to the active

state.

It is also recommended that long

command strings should be broken down

into shorter command strings. This

reduces the probability of noise on the

SCK pin corrupting the desired SPI

command string.

Command Name

# of

Bits

Writes

Value in

EEPROM

Operates on

Volatile/

Non-Volatile

memory

High

Voltage

(VIHH) on

CS pin?

Impact on

WiperLock or

Write Protect

Works

when

Wiper is

“locked”?

Write Data

16-Bits

Yes (1)

Both

—

unlocked (1)

Read Data

16-Bits

—

Both

—

unlocked (1)

Increment Wiper

8-Bits

—

Volatile Only

—

unlocked (1)

Decrement Wiper

8-Bits

—

Volatile Only

—

unlocked (1)

High Voltage Write Data

16-Bits

Yes

Both

Yes

unchanged

High Voltage Read Data

16-Bits

—

Both

Yes

unchanged

Yes

High Voltage Increment Wiper

8-Bits

—

Volatile Only

Yes

unchanged

High Voltage Decrement Wiper

8-Bits

—

Volatile Only

Yes

unchanged

Modify Write Protect or Wiper-

Lock Technology (High Voltage)

Enable

8-Bits

— (2)

Non-Volatile

Only (2)

Yes

locked/

protected (2)

Yes

Modify Write Protect or Wiper-

Lock Technology (High Voltage)

Disable

8-Bits

— (3)

Non-Volatile

Only (3)

Yes

unlocked/

unprotected (3)

Yes

Note 1:

This command will only complete if wiper is “unlocked” (WiperLock Technology is Disabled).

If the command is executed using address 02h or 03h, then that corresponding wiper is locked or

if with address 0Fh, then Write Protect is enabled.

If the command is executed using with address 02h or 03h, then that corresponding wiper is unlocked or

if with address 0Fh, then Write Protect is disabled.

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