MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 374

• Manufacturer Part Number: MMC2114
• Description: M CORE Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Serial Communications Interface Modules (SCI1 and SCI2)
17.8 Functional Description
17.9 Data Format
Advance Information
374
Serial Communications Interface Modules (SCI1 and SCI2)
The SCI allows full-duplex, asynchronous, non-return-to-zero (NRZ)
serial communication between the MCU and remote devices, including
other MCUs. The SCI transmitter and receiver operate independently,
although they use the same baud rate generator. The CPU monitors the
status of the SCI, writes the data to be transmitted, and processes
received data.
The SCI uses the standard NRZ mark/space data format shown in
Figure
Each frame has a start bit, eight or nine data bits, and one or two stop
bits. Clearing the M bit in SCCR1 configures the SCI for 10-bit frames.
Setting the M bit configures the SCI for 11-bit frames.
When the SCI is configured for 9-bit data, the ninth data bit is the T8 bit
in SCI Data Register high (SCIDRH). It remains unchanged after
transmission and can be used repeatedly without rewriting it. A frame
with nine data bits has a total of 11 bits.
START
START
Freescale Semiconductor, Inc.
BIT
BIT
For More Information On This Product,
17-13.
BIT 0
BIT 0
Go to: www.freescale.com
BIT 1
BIT 1
Figure 17-13. SCI Data Formats
BIT 2
BIT 2
BIT 3
BIT 3
M = 1 IN SCICR1
M = 0 in SCICR1
11-BIT FRAME
10-BIT FRAME
BIT 4
BIT 4
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
BIT 5
BIT 5
BIT 6
BIT 6
BIT 7
BIT 7
STOP
BIT 8
BIT
START
NEXT
STOP
BIT
BIT
MOTOROLA
START
NEXT
BIT