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ST72344S2 bảng dữ liệu(PDF) 156 Page - STMicroelectronics

tên linh kiện ST72344S2
Giải thích chi tiết về linh kiện  SCI asynchronous serial interface
PDF  247 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72344S2 bảng dữ liệu(HTML) 156 Page - STMicroelectronics

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On-chip peripherals
ST72344xx, ST2345xx
156/247
Doc ID 12321 Rev 6
master mode transmission. The resetting of the BUSY bit can then be handled in a
similar manner as the BERR flag being set.
●
AF: Detection of a non-acknowledge bit. In this case, the EVF and AF bits are set by
hardware with an interrupt if the ITE bit is set. To resume, set the Start or Stop bit.
The AF bit is cleared by reading the I2CSR2 register. However, if read before the
completion of the transmission, the AF flag will be set again, thus possibly generating a
new interrupt. Software must ensure either that the SCL line is back at 0 before reading
the SR2 register, or be able to correctly handle a second interrupt during the 9th pulse
of a transmitted byte.
●
ARLO: Detection of an arbitration lost condition.
In this case the ARLO bit is set by hardware (with an interrupt if the ITE bit is set and
the interface goes automatically back to slave mode (the M/SL bit is cleared).
Note:
In all these cases, the SCL line is not held low; however, the SDA line can remain low if the
last bits transmitted are all 0. It is then necessary to release both lines by software. The SCL
line is not held low while AF=1 but by other flags (SB or BTF) that are set at the same time.



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