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ST90135 датащи(PDF) 137 Page - STMicroelectronics

номер детали ST90135
подробное описание детали  8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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ST90135 датащи(HTML) 137 Page - STMicroelectronics

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ST90158 - SERIAL PERIPHERAL INTERFACE (SPI)
SERIAL PERIPHERAL INTERFACE (Cont’d)
9.4.7 S-Bus Interface
The S-bus is a three-wire bidirectional data-bus,
possessing functional features similar to the I
2C-
bus. As opposed to the I2C-bus, the Start/Stop
conditions are determined by encoding the infor-
mation on 3 wires rather than on 2, as shown in
Figure 71. The additional line is referred as SEN.
SPI Working with S-bus
The S-bus protocol uses the same pin configura-
tion as the I2C-bus for generating the SCL and
SDA lines. The additional SEN line is managed
through a standard ST9 I/O port line, under soft-
ware control (see Figure 67).
Figure 70. Mixed S-bus and I2C-bus System
n
Figure 71. S-bus Configuration
n
12
3
4
5
6
START
STOP
VA00440
SCL
SDA
SEN
9



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