Texas Instruments C2000 Workshop Guide And Lab Manual

Serial Communications Interface (SCI)
C2000 Microcontroller Workshop - Communications 13 - 11
SCI Data Timing
 Start bit valid if 4 consecutive SCICLK periods of
zero bits after falling edge
 Majority vote taken on 4
th
, 5
th
, and 6
th
SCICLK cycles
Start Bit
LSB of Data
Majority
Vote
Falling Edge Detected
SCIRXD
SCICLK
(Internal)
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2
Note: 8 SCICLK periods per data bit
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

Texas Instruments C2000 Specifications

General

Brand	Texas Instruments
Model	C2000
Category	Microcontrollers
Language	English