S-25C256A Datasheet, PDF (10/31 Pages) Seiko Instruments Inc – Write protect function during the low power supply voltage

SPI SERIAL E²PROM
S-25C256A
Rev.2.2_02_S
 Instruction Set
Table 14 is the list of instruction for the S-25C256A. The instruction is able to be input by changing the CS pin “H” to
“L”. Input the instruction in the MSB first. Each instruction code is organized with 1-byte as shown below. If the S-
25C256A receives any invalid instruction code, the device goes in the non-select status.
Table 14 Instruction Set
Instruction Code
Address
Data
Instruction
Operation
SCK Input Clock
1 to 8
SCK Input Clock SCK Input Clock SCK Input Clock
9 to 16
17 to 24
25 to 32
WREN
Write enable
0000 0110
−
−
−
WRDI
Write disable
0000 0100
−
−
−
RDSR
Read the status register
0000 0101
b7 to b0 output ^*1
−
−
WRSR
READ
Write in the status register
Read memory data
0000 0001
0000 0011
b7 to b0 input
A15 to A8 ^*2
−
A7 to A0
−
D7 to D0 output ^*3
WRITE
Write memory data
0000 0010
A15 to A8 ^*2
A7 to A0
D7 to D0 input
*1. Sequential data reading is possible.
*2. The higher addresses A15 = Don’t care.
*3. After outputting data in the specified address, data in the following address is output.
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