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Protocol
1.
Select 9-Bit UART Mode on the master and slave controllers.
2.
Set the SC0MOD0<WU> bit on each slave controller to 1 to enable data receiving.
3.
The master controller transmits data one frame at a time. Each frame includes an 8-bit
select code which identifies a slave controller. The MSB (bit 8) of the data (<TB8>) is
set to 1.
Start
4.
Each slave controller receives the above frame. Each controller checks the above select
code against its own select code. The controller whose code matches clears its <WU>
bit to 0.
5.
The master controller transmits data to the specified slave controller (the controller
whose SC0MOD0<WU> bit has been cleared to 0). The MSB (bit 8) of the data
(<TB8>) is cleared to 0.
Start
6.
The other slave controllers (whose <WU> bits remain at 1) ignore the received data
because their MSBs (bit 8 or <RB8>) are set to 0, disabling INTRX0 interrupts.
The slave controller whose <WU> bit = 0 can also transmit to the master controller. In
this way it can signal the master controller that the data transmission from the
master controller has been completed.
Bit0
1
2
3
Select code of slave controller
Bit0
1
2
3
Data
92CZ26A-338
4
5
6
7
"1"
4
5
6
7
Bit8
TMP92CZ26A
8
Stop
Stop
"0"
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