25CSM04 datasheet(24/55 Pages) MICROCHIP

Part #	25CSM04

Description	4-Mbit SPI Serial EEPROM with 128-Bit Serial Number and Enhanced Write Protection

PDF	55 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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24 / 55 page

25CSM04

DS20005817D-page 24

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6.2

Read STATUS Register (RDSR)

The Read STATUS Register (RDSR) instruction

provides access to the contents of the STATUS

CS pin followed by sending in a 05h opcode. The

device will return the 16-bit STATUS register value on

the SO pin.

The STATUS register can be continuously read for data

by continuing to read beyond the first 16-bit value

returned. The 25CSM04 will update the value of the

volatile bits (RDY/BSY, WEL and PREL) in the STATUS

STATUS register volatile bit values to be read without

having to issue a new RDSR instruction.

A new RDSR instruction needs to be initiated in order for

the nonvolatile bits (WPEN, BP0, BP1 and WPM) in the

STATUS register to be updated.

FIGURE 6-2:

READ STATUS REGISTER (RDSR) SEQUENCE

910 11

14 15

SCK

0 000010 1

RDSR Opcode (05h)

12 13

16 17 18 19 20 21 22 23

D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

STATUS Register Byte 0

STATUS Register Byte 1

High-Impedance

25CSM04 Datasheet(PDF) 24 Page - Microchip Technology