Freescale Semiconductor, Inc.
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
CTSA
RTSA
RxDA
TxDA
..... ....
.
.
SERIAL COMMUNICATIONS
CHANNELS A AND B
TxRDYA
CTSB
RTSB
RxDB
TxDB
X1
BAUD RATE
GENERATOR LOGIC
X2
SCLK
INTERNAL CHANNEL
CONTROL LOGIC
INTERRUPT CONTROL
LOGIC
Figure 7-1. Simplified Block Diagram
MOTOROLA
MC68340 USER’S MANUAL
7- 1
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