M65KA128AL datasheet(21/53 Pages) STMICROELECTRONICS

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M65KA128AL

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5.2

Extended Mode Register description

The Extended Mode Register is used to program Low Power self-refresh operation of the

device (PASR, DS, TCSR). It is used to select the area of the memory array refreshed

during Partial Array Self Refresh operations, and the driver strength.

It is loaded by issuing a Extended Mode Register Set command that programs A0 to A11

address bits. The values placed on the address lines are then latched into the Extended

Mode Register. BA0 and BA1 must be set to ‘0’ and ‘1’ respectively.

See Table 5: Extended Mode Register Definition, for more details.

Table 5.

Extended Mode Register Definition

Address

Bits

Mode

Description

Value

Bit Description

A11-A10

EMR9

Auto

Temperature

Compensated

Self Refresh

(ATCSR)

Enabled

Reserved

A8-A7

A6-A5

EMR6-EMR5

Driver Strength

Bits

Full Strength

1/2 Strength

1/4 Strength

1/8 Strength

A4-A3

EMR4-EMR3

A2-A0

EMR2-EMR0

Self Refresh

Area Bits

000

All Banks

001

Two Banks (BA1=0)

010

One Banks (BA0 and BA1 =0)

Other configurations reserved

BA1-BA0

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