SST25PF080B datasheet(14/32 Pages) MICROCHIP

14 / 32 page

SST25PF080B

DS20005137B-page 14

 2014 Microchip Technology Inc.

4.8

Program Security ID

The Program SID instruction programs a byte of data in

the user-programmable, Security ID space. Security ID

addresses 08h-1FH are the user-programmable loca-

tions. The device ignores a Program Security ID

instruction pointing to an invalid or protected address,

see Table 4-5. Prior to the program operation, execute

WREN.

To execute a Program SID operation, the host drives

CE# low, sends the Program SID command cycle

(A5H), one address cycle, the data to be programmed,

then drives CE# high. Each cycle is eight clocks long,

most significant bit first. To determine the completion of

the internal, self-timed Program SID operation, poll the

BUSY bit in the software status register, or wait TPSID

for the completion of the internal self-timed Program

SID operation.

4.8.1

READ-STATUS-REGISTER (RDSR)

The Read-Status-Register (RDSR) instruction allows

reading of the status register. The status register may

be read at any time even during a Write (Program/

Erase) operation. When a Write operation is in prog-

ress, the Busy bit may be checked before sending any

new commands to assure that the new commands are

properly received by the device. CE# must be driven

low before the RDSR instruction is entered and remain

low until the status data is read. Read-Status-Register

is continuous with ongoing clock cycles until it is termi-

nated by a low to high transition of the CE#. See Figure

4-14 for the RDSR instruction sequence.

FIGURE 4-14:

READ-STATUS-REGISTER (RDSR) SEQUENCE

TABLE 4-5:

PROGRAM SECURITY ID

Program Security ID

Address Range

Pre-Programmed at factory

00H – 07H

User Programmable

08H – 1FH

25137 RDSRseq.0

MODE 3

SCK

CE#

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

MODE 0

HIGH IMPEDANCE

Status

MSB

SST25PF080B датащи(PDF) 14 Page - Microchip Technology

SST25PF080B датащи(HTML) 14 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

датащи скачать

ссылки URL