Datasheet

UART Modules
12-4 MCF5206e USER’S MANUAL MOTOROLA
muxed with RSTO at the pin. Their functionality is determined by programming the Pin
Assignment Register (PAR) in the SIM.
12.2.2 Receiver Serial Data Input (RxD)
This signal is the receiver serial data input. Data received on this signal is sampled on the
rising edge of the clock source, with the least significant bit received first.
12.2.3 Request-To-Send (RTS)
You can program this active-low output signal to be automatically negated and asserted
by either the receiver or transmitter. When connected to the clear-to-send (CTS
) input of
a transmitter, this signal controls serial data flow.
12.2.4 Clear-To-Send (CTS)
This active-low input is the clear-to-send input and can generate an interrupt on change-
of-state.
Figure 12-2. External and Internal Interface Signals
INTERNAL
CONTROL
LOGIC
FOUR-CHARACTER
RECEIVE BUFFER
TWO-CHARACTER
TRANSMIT BUFFER
INPUT PORT
OUTPUT PORT
EXTERNAL INTERFACE SIGNALS
INTERFACE TO CPU
UART MODULE INTERNAL BUS
ADDRESS BUS
CONTROL
DATA
16-BIT TIMER/
BAUD RATE GENERATOR
SYSTEM CLOCK
IRQ
CTS
RTS
RXD
TXD
TIN(EXTCLK)
Fr
eescale S
emiconduct
or
, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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