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AN2014 Folha de dados(PDF) 39 Page - STMicroelectronics

Nome de Peças AN2014
Descrição Electrónicos  How a designer can make the most of STMicroelectronics serial EEPROMs
PDF  65 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2014 Folha de dados(HTML) 39 Page - STMicroelectronics

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AN2014
Software considerations
64
Figure 33. I2C data polling algorithm
1. Using the READ Device code (R/W = 1) is hazardous due to I2C protocol constraints.
SPI products
In SPI products, a specific instruction (Read Status Register - RDSR) is used to check the
status of the WIP (Write In Progress) bit in the Status Register. A loop on the RDSR
command (RDSR instruction + Data byte) checks the WIP bit status. As soon as it returns to
"0", the device is ready to accept new commands. For compatibility reasons, it is
recommended to send the full RDSR command each time instead of continuously reading
the status register.
Ai11083
START
Device select byte
with R/W = 0 (1)
ACK?
STOP
Ready for new command
Yes
Yes
No
Write in Progress
(Re)START



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