MR25H10 Everspin Technologies, Inc, MR25H10 Datasheet - Page 7

• Manufacturer Part Number: MR25H10
• Description: Mr25h10 1mb Serial Spi Mram
• Manufacturer: Everspin Technologies, Inc

Everspin Technologies © 2009
The WRSR command is entered by driving CS low, sending the command code and status register write data
byte, and then driving CS high.
SPI COMMUNICATIONS PROTOCOL
SCK
Read Data Bytes (READ)
CS
SO
The Read Data Bytes (READ) command allows data bytes to be read starting at an address specified by the
24-bit address. Only address bits 0-16 are decoded by the memory. The data bytes are read out sequen-
tially from memory until the read operation is terminated by bringing CS high The entire memory can be
read in a single command. The address counter will roll over to 0000h when the address reaches the top of
memory.
The READ command is entered by driving CS low and sending the command code. The memory drives the
read data bytes on the SO pin. Reads continue as long as the memory is clocked. The command is termi-
nated by bring CS high.
SI
0
0
0
1
0
SCK
CS
SO
2
SI
Instruction (03h)
0
3
0
4
0
0
0
5
High Impedance
0
1
1
6
0
2
1
7
Instruction (01h)
0
MSB
3
X
8
0
4
X
Figure 2.4 WRSR
9
Figure 2.5 READ
0
5
X
10
High Impedance
24-Bit Address
0
6
7
1
7
3
28
MSB
7
8
2
29
6
Document Number: MR25H10 Rev. 4, 2/2010
9
1
30
5
10
Status Register In
0
31
4
11
MSB
7
32
3
12
6
32
2
13
5
32
1
14
Data Out 1
4
32
0
15
3
32
Mode 3
Mode 0
MR25H10
2
32
1
32
0
32
7
Data Out 2