SST25VF064C datasheet(21/37 Pages) MICROCHIP

21 / 37 page

DS20005036C

04/15

64 Mbit SPI Serial Dual I/O Flash

SST25VF064C

EOL Data Sheet

Program Security ID

The Program SID instruction programs one to 24 bytes of data in the user-programmable, Security ID

space. The device ignores a Program SID instruction pointing to an invalid or protected address, see

Table 7. 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. The programmed data

must be between 1 to 24 Bytes and in whole Byte increments. To determine the completion of the inter-

nal, 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.

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

progress, 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 terminated by a low to high transition of the CE#. See Figure 16 for the RDSR

instruction sequence.

Figure 16:Read-Status-Register (RDSR) Sequence

Table 7: Program Security ID

Program Security ID

Address Range

Pre-Programmed at factory

00H – 07H

User Programmable

08H – 1FH

T7.0

25036

1392 F17.0

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

SST25VF064C Datasheet(PDF) 21 Page - Microchip Technology