C8051T600SDB Silicon Laboratories Inc, C8051T600SDB Datasheet - Page 141

BOARD SOCKET DAUGHTER SOIC

C8051T600SDB

Manufacturer Part Number
C8051T600SDB
Description
BOARD SOCKET DAUGHTER SOIC
Manufacturer
Silicon Laboratories Inc
Datasheet

Specifications of C8051T600SDB

Module/board Type
Socket Module - SOIC
Data Bus Width
8 bit
Operating Supply Voltage
+ 1.8 V to + 3.6 V
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051T600DK
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1405
24.3. Multiprocessor Communications
The 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 (SCON0.5) 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 1 (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 transmis-
sions 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 24.6. UART Multi-Processor Mode Interconnect Diagram
TX
RX
Device
Slave
TX
Rev. 1.2
RX
Device
Slave
C8051T600/1/2/3/4/5/6
TX
RX
Device
Slave
TX
V+
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