ST92185B STMicroelectronics, ST92185B Datasheet - Page 148

• Manufacturer Part Number: ST92185B
• Description: 16k/24k/32k Rom Hcmos Mcu With On-screen-display
• Manufacturer: STMicroelectronics

ST92185B - SERIAL PERIPHERAL INTERFACE (SPI)
SERIAL PERIPHERAL INTERFACE (Cont’d)
7.6.7 S-Bus Interface
The S-bus is a three-wire bidirectional data-bus,
possessing functional features similar to the I
bus. As opposed to the I
conditions are determined by encoding the infor-
mation on 3 wires rather than on 2, as shown in
Figure
Figure 92. Mixed S-bus and I
n
Figure 93. S-bus Configuration
n
148/178
SDA
SEN
SCL
START
8. The additional line is referred as SEN.
1
2
3
2
C-bus, the Start/Stop
2
C-bus System
4
5
VA00440
STOP
6
2
C-
SPI Working with S-bus
The S-bus protocol uses the same pin configura-
tion as the I
SDA lines. The additional SEN line is managed
through a standard ST9 I/O port line, under soft-
ware control (see
2
C-bus for generating the SCL and
Figure
4).