s-25a080a Seiko Instruments Inc., s-25a080a Datasheet - Page 19

• Manufacturer Part Number: s-25a080a
• Description: 25?c Operation Spi Serial E2prom For Automotive Electric Component
• Manufacturer: Seiko Instruments Inc.

SCK
Rev.1.0
WP
SO
CS
125°C OPERATION SPI SERIAL E
6. Read memory data (READ)
SI
Remark In the S-25A080A, the higher addresses A15 to A10 = Don’t care.
Next, by inputting the serial clock (SCK) keeping the chip select ( CS ) in “L”, the address is automatically incremented
so that data in the following address is sequentially output. The address counter rolls over to the first address by
increment in the last address.
To finish the Read cycle, set CS to “H”. It is possible to raise the chip select always during the cycle. During Write, the
Read instruction code is not be accepted or operated.
The Read operation is shown below. Input the instruction code and the address from serial data input (SI) after
inputting “L” to the chip select ( CS ). The input address is loaded to the internal address counter, and data in the
address is output from the serial data output (SO).
_00
In the S-25A160A, the higher addresses A15 to A11 = Don’t care.
In the S-25A320A, the higher addresses A15 to A12 = Don’t care.
1
2
3
Instruction
4
High-Z
5
6
7
8
A15 A14 A13
Figure 14 Read Operation
High / Low
9
2
PROM FOR AUTOMOTIVE ELECTRIC COMPONENT
Seiko Instruments Inc.
10
11
16-bit Address
12
A3
13
A2
14
A1
15
A0
16
D7
17
D6
18
Outputs the First Byte
D5
19
S-25A080A/160A/320A
D4
20
D3
21
D2
22
D1
23
D0
24
the Second
Outputs
D7
19