S-25A010A Datasheet, PDF (13/35 Pages) Seiko Instruments Inc – Write protect function during the low power supply voltage

Rev.5.2_01
FOR AUTOMOTIVE 125°C OPERATION SPI SERIAL E²PROM
S-25A010A/020A/040A
 Instruction Sets
Table 19 and Table 20 are the list of instruction for this IC. The instruction is able to be input by changing the CS "H" to
"L". Input the instruction in the MSB first. Each instruction code is organized with 1-byte as shown below. If this IC
receives any invalid instruction code, this IC goes in the non-select status.
1. S-25A010A/020A
Table 19 Instruction Set
Instruction Code
Address
Instruction
Operation
SCK Input Clock
SCK Input Clock
1 to 8
9 to 16
WREN
Write enable
0000 X110
－
WRDI
Write disable
0000 X100
－
RDSR
Read the status register
0000 X101
b7 to b0 output^*1
WRSR
Write in the status register
0000 X001
b7 to b0 input
READ
Read memory data
0000 X011
A7^*2 to A0
WRITE
Write memory data
0000 X010
A7^*2 to A0
*1. Sequential data reading is possible.
*2. In the S-25A010A, A7 = Don’t care because the address range is A6 to A0.
*3. After outputting data in the specified address, data in the following address is output.
Data
SCK Input Clock
17 to 24
－
－
－
－
D7 to D0 output^*3
D7 to D0 input
Remark X = Don't care.
2. S-25A040A
Table 20 Instruction Set
Instruction Code
Address
Instruction
Operation
SCK Input Clock
1 to 8
SCK Input Clock
9 to 16
WREN
Write enable
0000 X110
－
WRDI
Write disable
0000 X100
－
RDSR
Read the status register
0000 X101
b7 to b0 output^*1
WRSR
Write in the status register
0000 X001
b7 to b0 input
READ
Read memory data
0000 [A8^*2]011
A7 to A0
WRITE
Write memory data
0000 [A8^*2]010
A7 to A0
*1. Sequential data reading is possible.
*2. In the S-25A040A, assign bit A8 in the address into the fifth bit in an instruction code.
*3. After outputting data in the specified address, data in the following address is output.
Data
SCK Input Clock
17 to 24
－
－
－
－
D7 to D0 output^*3
D7 to D0 input
Remark X = Don't care.
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