23K256-ISLASHST datasheet(11/27 Pages) MICROCHIP

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DS20002100G-page 11

23A256/23K256

2.5

Read Status Register Instruction

(RDSR)

The Read Status Register instruction (RDSR) provides

access to the STATUS register. The STATUS register

may be read at any time. The STATUS register is

formatted as follows:

The mode bits indicate the operating mode of the

SRAM. The possible modes of operation are:

0 0 = Byte mode (default operation)

1 0 = Page mode

0 1 = Sequential mode

1 1 = Reserved

Write and read commands are shown in Figure 2-7 and

Figure 2-8.

The HOLD bit enables the Hold pin functionality. It must

be set to a ‘0’ before HOLD pin is brought low for HOLD

function to work properly. Setting HOLD to ‘1’ disables

the feature.

Bits 1 through 5 are reserved and should always be set

to ‘0’.

See Figure 2-7 for the RDSR timing sequence.

FIGURE 2-7:

READ STATUS REGISTER TIMING SEQUENCE (RDSR)

TABLE 2-2:

STATUS REGISTER

W/R

–

W/R

MODE MODE

HOLD

Note 1: W/R = writable/readable.

1011

12131415

Instruction

Data from STATUS Register

High-Impedance

SCK

234

567

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