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16.38MHz
HI_REF_CLK
Data
Control
11.2 UART Signals
11.2.1 RTS — Request to Send (UART0)
An external device requests data from the UART by asserting the RTS input. When
the ignore RTS (IRTS) bit is set, the UART ignores the RTS input and sends a charac-
ter whenever a character is ready to transmit.
If RTS goes high during transmission, the UART finishes sending the current charac-
ter and then shuts off. FIFO content (characters to be transmitted) is undisturbed.
Any transition on the pin can cause an interrupt request to wake up the MCU from low
power state. Interrupts are enabled by the RTSD EN bit in UART control register 1.
This pin can also be used as a general-purpose input whose status is read in the
RTSS bit in the UART status register.
11.2.2 CTS — Clear to Send (UART0)
The UART signals an external device that it is ready to receive data by asserting the
CTS output. If the receiver detects a pending overrun, it negates the CTS output.
This pin can also be used as a general purpose output controlled by the CTS bit in
UART control register 2.
MOTOROLA
UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER MODULE
11-2
All manuals and user guides at all-guides.com
Freescale Semiconductor, Inc.
16x Bit Clock
Generator
Figure 11-1 UART Channel Block Diagram
For More Information On This Product,
Go to: www.freescale.com
Receiver
Data Path
Transmitter
Data Path
REFERENCE MANUAL
RTS
CTS
TxD
RxD
MMC2001
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