Serial Communications Interface (SCI)
Baud Rate Determination: The values in the baud-select registers (SCIHBAUD and SCILBAUD)
concatenate to form a 16 bit number that specifies the baud rate for the SCI.
• For BRR = 1 to 65535:
SCI Baud Rate =
8)1( ×+BRR
CLKOUT
bits/sec
• For BRR = 0:
SCI Baud Rate =
16
CLKOUT
bits/sec
Max data rate = 9.3 Mbps @ 150 MHz
Note that the CLKOUT for the SCI module is one-half the CPU clock rate.
Multiprocessor Wake-Up Modes
Multiprocessor Wake-Up Modes
Allows numerous processors to be hooked
up to the bus, but transmission occurs
between only two of them
Idle-line or Address-bit modes
Sequence of Operation
1. Potential receivers set SLEEP = 1, which disables RXINT
except when an address frame is received
2. All transmissions begin with an address frame
3. Incoming address frame temporarily wakes up all SCIs on bus
4. CPUs compare incoming SCI address to their SCI address
5. Process following data frames only if address matches
11 - 14 C28x - Communications
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