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Figure 13-2 shows an example of an I
2
trollers. Both I
C bus lines, SDA and SCL are bidirectional lines, connected to a
positive supply voltage via a pullup resistor. The open-drain output pins of the
microcontrollers perform the wired-AND function on the bus. The software
controls when each microcontroller operates as a transmitter or receiver, or
whether is in master or slave mode.
Pullup
resistors
Clock output
Data
output
Clock input
Data input
Device 1
Figure 13-2 Connection of Two Microcontrollers to the I
Table 13-2 describes the four possible operating modes for devices on the I
bus.
Table 13-2 Operating Modes for Devices on an I
Operating Mode
Master transmitter
Device that generates the serial transfer clock (SCL) signal and
transmits serial data to a slave device in sync with SCL
Master receiver
Device that generates the SCL signal and receives serial data from
a slave device in sync with SCL
Slave transmitter
Device that transmits data in sync with the SCL signal from the mas-
ter
Slave receiver
Device that receives data in sync with the SCL signal from the master
294
Panasonic
2
C bus configuration using two microcon-
R
R
Clock output
Data
output
Clock input
Data input
Device 2
2
C Bus
Description
MN102H75K/F75K/85K/F85K LSI User Manual
2
I
C Bus Controller
Description
V
DD
Data line (SDA)
Clock line (SCL)
2
C Bus
2
C
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