C8051F302-GSR Silicon Labs, C8051F302-GSR Datasheet - Page 135
C8051F302-GSR
Manufacturer Part Number
C8051F302-GSR
Description
8-bit Microcontrollers - MCU 8KB 8ADC 14Pin MCU
Manufacturer
Silicon Labs
Datasheet
1.C8051F301-GSR.pdf
(178 pages)
Specifications of C8051F302-GSR
Rohs
yes
Core
8051
Data Bus Width
8 bit
Processor Series
C8051
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14.3. Multiprocessor Communications
9-Bit UART mode supports multiprocessor communication between a master processor and one or more
slave processors by special use of the ninth data bit. When a master processor wants to transmit to one or
more slaves, it first sends an address byte to select the target(s). An address byte differs from a data byte
in that its ninth bit is logic 1; in a data byte, the ninth bit is always set to logic 0.
Setting the MCE0 bit (SCON.5) of a slave processor configures its UART such that when a stop bit is
received, the UART will generate an interrupt only if the ninth bit is logic one (RB80 = 1) signifying an
address byte has been received. In the UART interrupt handler, software will compare the received
address with the slave's own assigned 8-bit address. If the addresses match, the slave will clear its MCE0
bit to enable interrupts on the reception of the following data byte(s). Slaves that weren't addressed leave
their MCE0 bits set and do not generate interrupts on the reception of the following data bytes, thereby
ignoring the data. Once the entire message is received, the addressed slave resets its MCE0 bit to ignore
all transmissions until it receives the next address byte.
Multiple addresses can be assigned to a single slave and/or a single address can be assigned to multiple
slaves, thereby enabling "broadcast" transmissions to more than one slave simultaneously. The master
processor can be configured to receive all transmissions or a protocol can be implemented such that the
master/slave role is temporarily reversed to enable half-duplex transmission between the original master
and slave(s).
RX
Master
Device
Figure 14.6. UART Multi-Processor Mode Interconnect Diagram
TX
RX
Device
Slave
TX
Rev. 2.9
RX
Device
Slave
TX
C8051F300/1/2/3/4/5
RX
Device
Slave
TX
+5V
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