MC68HC12 Datasheet, PDF (279/478 Pages) Motorola, Inc – The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit

Multiple Serial Interface
Serial Communication Interface (SCI)
MCLK
BAUD RATE
CLOCK
SCI TRANSMITTER
MSB
LSB
DIVIDER
Rx Baud Rate
PARITY
GENERATOR
10-11 Bit SHIFT REG
TxD BUFFER/SCxDRL
SCxBD/SELECT
Tx Baud Rate
TxD
SCxCR1/SCI CTL 1
TxMTR CONTROL
DATA BUS
SCxCR2/SCI CTL 2
SCxSR1/INT STATUS
RxD
INT REQUEST LOGIC
TO
INTERNAL
LOGIC
PARITY
DETECT
DATA RECOVERY
SCI RECEIVER
MSB
LSB
10-11 BIT SHIFT REG
TxD BUFFER/SCxDRL
SCxCR1/SCI CTL 1
WAKE-UP LOGIC
SCxSR1/INT STATUS
INT REQUEST LOGIC
SCxCR2/SCI CTL 2
HC12A4 SCI BLOCK
Figure 16-2. Serial Communications Interface Block Diagram
MC68HC912DT128A — Rev 4.0
MOTOROLA
Multiple Serial Interface
Technical Data
279