mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 1059

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

43.3 Module Memory Map
This section provides a detailed description of all memory and registers.
Accessing reserved addresses within the memory map will result in a transfer error. None
of the contents of the implemented addresses will be modified as a result of that access.
Only byte accesses are supported.
Freescale Semiconductor, Inc.
Signal
RXD
CTS
RTS
TXD
I/O
O
O
I
I
Table 43-2. UART—Detailed signal descriptions
State meaning
State meaning
State meaning
Clear to send. Indicates whether the UART can start to transmit data when flow control is
MCF51JF128 Reference Manual, Rev. 2, 03/2011
receive data. When driven by the transmitter, can enable an external transceiver during
Request to send. When driven by the receiver, indicates whether the UART is ready to
Meaning
Timing
Timing
Timing
Timing
State
Asserted—Data transmission can start.
Negated—Data transmission can not start.
Assertion—When transmitting device's RTS asserts.
Negation—When transmitting device's RTS deasserts.
Asserted—When driven by the receiver, ready to receive data. When
driven by the transmitter, enable the external transmitter.
Negated—When driven by the receiver, not ready to receive data. When
driven by the transmitter, disable the external transmitter.
Assertion—Can occur at any time; can assert asynchronously to the other
input signals.
Negation—Can occur at any time; can deassert asynchronously to the
other input signals.
Whether RXD is interpreted as a '1' or '0' depends on the bit encoding
method along with other configuration settings.
Sampled at a frequency determined by the module clock divided by the
baud rate.
Whether TXD is interpreted as a '1' or '0' depends on the bit encoding
method along with other configuration settings.
Driven at the beginning or within a bit time according to the bit encoding
method along with other configuration settings. Otherwise, transmissions
are independent of reception timing.
Transmit data. Serial data output from transmitter.
Chapter 43 Universal Asynchronous Receiver/Transmitter (UART)
Preliminary
Receive data. Serial data input to receiver.
transmission.
Description
enabled.
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