MR20H40CDF Ver la hoja de datos (PDF) - Extech Instruments Corporation.
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MR20H40CDF Datasheet PDF : 28 Pages
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MR20H40 / MR25H40
Read Status Register (RDSR)
The Read Status Register (RDSR) command allows the Status Register to be read. The Status Register can be
read at any time to check the status of write enable latch bit, status register write protect bit, and block write
protect bits. For MR2xH40, the write in progress bit (bit 0) is not written by the memory because there is no
write delay. The RDSR command is entered by driving CS low, sending the command code, and then driving
CS high.
Figure 4 – Read Status Register (RDSR) Timing
CS
SCK
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7 Mode 3
Mode 0
SI
0
0
0
0
0
1
0
1
MSB
Status Register Out
SO
High Impedance
High Z
7
6
5
4
3
2
1
0
MSB
Write Enable (WREN)
The Write Enable (WREN) command sets the Write Enable Latch (WEL) bit in the status register (bit 1). The
Write Enable Latch must be set prior to writing either bit in the status register or the memory. The WREN
command is entered by driving CS low, sending the command code, and then driving CS high.
Figure 5 – Write Enable (WREN) Timing
CS
SCK
Mode 3
Mode 0
0
1
2
3
4
5
6
7
Instruction (06h)
Mode 3
Mode 0
SI
0
0
0
0
0
1
1
0
SO
High Impedance
Copyright © Everspin Technologies 2014
9
MR20H40 / MR25H40 Revision 11, 8/2014
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