Datasheet

UART Modules
MOTOROLA MCF5206e USER’S MANUAL 12-13
transmitter link is disabled. This mode is useful for testing remote channel receiver and
transmitter operation. While in this mode, the receiver clocks the transmitter.
Because the receiver is not active, the CPU cannot read received data. All status
conditions are inactive. Received parity is not checked and is not recalculated for
transmission. Stop bits are transmitted as received. A received break is echoed as
received until the next valid start bit is detected.
Figure 12-7. Looping Modes Functional Diagram
(a) Automatic Echo
(b) Local Loopback
(c) Remote Loopback
DISABLED
DISABLED
DISABLED
DISABLED
Rx
Tx
Rx
Tx
Rx
Tx
TxD
OUTPUT
RxD
INPUT
RxD
INPUT
RxD
INPUT
TxD
OUTPUT
TxD
OUTPUT
DISABLED
DISABLED
CPU
CPU
CPU
DISABLED
DISABLED
Fr
eescale S
emiconduct
or
, I
Freescale Semiconductor, Inc.
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