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S-25C320A Datasheet, PDF (11/39 Pages) Seiko Instruments Inc – Write protect function during the low power supply voltage | |||
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Rev.4.2_02_H
SPI SERIAL E2PROM
S-25C320A/640A
ï® Instruction Set
Table 16 is the list of instruction for the S-25C320A/640A. The instruction is able to be input by changing the CS pin âHâ
to âLâ. Input the instruction in the MSB first. Each instruction code is organized with 1-byte as shown below. If the
S-25C320A/640A receives any invalid instruction code, the device goes in the non-select status.
Table 16 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
â
â
â
WRDI
Write disable
0000 0100
â
â
â
RDSR
Read the status register
0000 0101
b7 to b0 output *1
â
â
WRSR
READ
Write in the status register
Read memory data
0000 0001
0000 0011
b7 to b0 input
A15 to A8 *2
â
A7 to A0
â
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. In the S-25C320A, the higher addresses A15 to A12 = Donât care.
In the S-25C640A, the higher addresses A15 to A13 = Donât care.
*3. After outputting data in the specified address, data in the following address is output.
11
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