X25170 Datasheet, PDF (7/15 Pages) IC MICROSYSTEMS – SPI Serial E 2 PROM with Block Lock ™ Protection

X25170
Figure 5. Page Write Operation Sequence
CS
SCK
0 1 2 3 4 5 6 7 8 9 10
20 21 22 23 24 25 26 27 28 29 30 31
Instruction
SI
16 Bit Address
Data Byte 1
15 14 13
3210 76543210
CS
SCK
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
Data Byte 2
Data Byte 3
SI
76543210 76543210
Data Byte N
6543210
Figure 6. Write Status Register Operation Sequence
CS
SCK
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Instruction
SI
Data Byte
7 6 5 43 2 1 0
High Impedance
SO
Operational Notes
The X25170 powers-up in the following state:
– The device is in the low power standby state.
– A HIGH to LOW transition on CS is required to enter
an active state and receive an instruction.
– SO pin is high impedance.
– The “write enable” latch is reset.
Data Protection
The following circuitry has been included to prevent
inadvertent writes:
– The “write enable” latch is reset upon power-up.
– A WREN instruction must be issued to set the “write
enable” latch.
– CS must come HIGH at the proper clock count in order
to start a write cycle.
Characteristics subject to change without notice. 7 of 15