Sci Signal Descriptions - NXP Semiconductors MC9S08SU16 Reference Manual

22.3 SCI signal descriptions

The SCI signals are shown in the table found here.
Signal
RxD
TxD
22.3.1 Detailed signal descriptions
The detailed signal descriptions of the SCI are shown in the following table.
Signal I/O
RxD
TxD I/O
22.4 Register definition
The SCI has 8-bit registers to control baud rate, select SCI options, report SCI status, and
for transmit/receive data.
Refer to the direct-page register summary in the memory chapter of this document or the
absolute address assignments for all SCI registers. This section refers to registers and
control bits only by their names. An NXP-provided equate or header file is used to
translate these names into the appropriate absolute addresses.
NXP Semiconductors
Table 22-2. SCI signal descriptions
Table 22-3. SCI—Detailed signal descriptions
I
State meaning
Timing
Transmit data. Serial data output from transmitter.
State meaning
Timing
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
Chapter 22 Serial Communications Interface (SCI)
Description
Receive data
Transmit data
Description
Receive data. Serial data input to receiver.
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.
I/O
I
I/O
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