MC68306 Motorola, MC68306 Datasheet - Page 115

• Manufacturer Part Number: MC68306
• Description: Integrated EC000 Processor
• Manufacturer: Motorola

6.3 OPERATION
The following paragraphs describe the operation of the baud rate generator, transmitter
and receiver, and other functional operating modes of the serial module.
6.3.1 Baud Rate Generator
The baud rate generator consists of a crystal oscillator, baud rate generator, and clock
selectors (see Figure 6-3). The crystal oscillator operates directly from a 3.6864-MHz
crystal or from an external clock of the same frequency. Baud rates are selected by
programming the clock-select register (DUCSR) for each channel.
6.3.2 Transmitter and Receiver Operating Modes
The functional block diagram of the transmitter and receiver, including command and
operating registers, is shown in Figure 6-4. The paragraphs that follow contain
descriptions for both these functions in reference to this diagram. For detailed register
information, refer to 6.4 Register Description and Programming.
MOTOROLA
Figure 6-3. Baud Rate Generator Block Diagram
MC68306 USER'S MANUAL
GENERATOR LOGIC
OSCILLATOR
GENERATOR
SELECTORS
BAUD RATE
BAUD RATE
CRYSTAL
CLOCK
EXTERNAL
INTERFACE
. .
X1
X2
6-7