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25CSM04 датащи(PDF) 24 Page - Microchip Technology

номер детали 25CSM04
подробное описание детали  4-Mbit SPI Serial EEPROM with 128-Bit Serial Number and Enhanced Write Protection
PDF  55 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

25CSM04 датащи(HTML) 24 Page - Microchip Technology

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25CSM04
DS20005817D-page 24
 2019-2022 Microchip Technology Inc. and its subsidiares
6.2
Read STATUS Register (RDSR)
The Read STATUS Register (RDSR) instruction
provides access to the contents of the STATUS
register. The STATUS register is read by asserting the
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
register at byte boundaries, thereby allowing new
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
SI
910 11
14 15
SCK
0
2
3
4
5
6
7
1
8
0 000010 1
RDSR Opcode (05h)
12 13
16 17 18 19 20 21 22 23
D7
D5
D6
D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
STATUS Register Byte 0
STATUS Register Byte 1
SO
CS
High-Impedance



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