s-25a080a Seiko Instruments Inc., s-25a080a Datasheet - Page 17

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

Rev.1.0
125°C OPERATION SPI SERIAL E
4. Read the status register (RDSR)
SCK
WP
SO
CS
Reading data in the status register is possible by the RDSR instruction. During the Write operation, it is possible to
confirm the progress by checking bit WIP.
It is possible to read the status register always. The bits in it are valid and can be read by RDSR even in the Write
cycle.
However, during the Write cycle in progress, the nonvolatile bits SRWD, BP1, BP0 are fixed in a certain value. These
updated values of bit can be obtained by inputting another new RDSR instruction after the Write cycle has completed.
Contrarily, two of Read Only bits WEL and WIP are being updated while the Write cycle is in progress.
Set the chip select ( CS ) “L” first. After that, input the instruction code from serial data input (SI). The status of bit in the
status register is output from serial data output (SO). Sequential Read is available for the status register. To stop the
Read cycle, set CS to “H”.
SI
_00
1
2
3
Instruction
High-Z
4
Figure 12 RDSR Operation
5
2
PROM FOR AUTOMOTIVE ELECTRIC COMPONENT
Seiko Instruments Inc.
6
High / Low
7
8
b7
9
Outputs Data in the Status Register
b6
10
b5
11
b4
12
S-25A080A/160A/320A
b3
13
b2
14
b1
15
b0
16
b7
17