Typewriter User Manual

MOTOROLA MC68340 USER’S MANUAL 7- 1
SECTION 7
SERIAL MODULE
The MC68340 serial module is a dual universal asynchronous/synchronous
receiver/transmitter that interfaces directly to the CPU32 processor via the intermodule
bus (IMB). The serial module, shown in Figure 7-1, consists of the following major
functional areas:
• Two Independent Serial Communication Channels (A and B)
• Baud Rate Generator Logic
• Internal Channel Control Logic
• Interrupt Control Logic
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SERIAL COMMUNICATIONS
CHANNELS A AND B
BAUD RATE
GENERATOR LOGIC
INTERNAL CHANNEL
CONTROL LOGIC
X1
X2
SCLK
INTERRUPT CONTROL
LOGIC
RxDB
RxDA
TxDB
TxDA
CTSB
CTSA
RTSB
RTSA
TxRDY
A
RxRDY
A
Figure 7-1. Simplified Block Diagram
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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