MC68HC812A4 Datasheet, PDF (260/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

Serial Communications Interface Module (SCI)
14.11 Interrupt Sources
Table 14-8. SCI Interrupt Sources
Interrupt
Source
Transmit data register empty
Transmission complete
Receive data register full
Receiver overrun
Receiver idle
Flag
Local CCR
Enable Mask
Vector
Address
SCI0 SCI1
TDRE TIE
I bit
TC
RDRF
OR
TCIE
RIE
I bit
$FFD6, $FFD4,
I bit ^{$FFD7 $FFD5}
IDLE ILIE I bit
14.12 General-Purpose I/O Ports
Port S shares its pins with the multiple serial interface (MSI). In all
modes, port S pins PS7–PS0 are available for either general-purpose
I/O or for SCI and SPI functions. See Section 13. Multiple Serial
Interface (MSI).
14.13 Serial Character Transmission using the SCI
Code is intended to use SCI1 to serially transmit characters using polling
to the LCD display on the UDLP1 board: when the transmission data
register is empty a flag will get set, which is telling us that SC1DR is
ready so we can write another byte. The transmission is performed at a
baud rate of 9600. Since the SCI1 is only being used for transmit data,
the data register will not be used bidirectionally for received data.
14.13.1 Equipment
For this exercise, use the M68HC812A4EVB emulation board.
MC68HC812A4 — Rev. 3.0
260
Serial Communications Interface Module (SCI)
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