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Serial Communications Interface Module (SCI)
18.4 Pin Name Conventions
18.5 Functional Description
Technical Data
240
Freescale Semiconductor, Inc.
The generic names of the SCI I/O pins are:
•
RxD (receive data)
•
TxD (transmit data)
SCI I/O (input/output) lines are implemented by sharing parallel I/O port
pins. The full name of an SCI input or output reflects the name of the
shared port pin.
Table 18-1
of the SCI I/O pins.
The generic pin names appear in the text of this section.
Table 18-1. Pin Name Conventions
Generic Pin Names:
Full Pin Names:
Figure 18-1
shows the structure of the SCI module. The SCI allows full-
duplex, asynchronous, NRZ serial communication among the MCU and
remote devices, including other MCUs. The transmitter and receiver of
the SCI operate independently, although they use the same baud rate
generator. During normal operation, the CPU monitors the status of the
SCI, writes the data to be transmitted, and processes received data.
The baud rate clock source for the SCI can be selected via the
configuration bit, SCIBDSRC, of the CONFIG2 register ($001E). Source
selection values are shown in
Serial Communications Interface Module (SCI)
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shows the full names and the generic names
RxD
PTE1/RxD
Figure
18-1.
MC68HC908GP32
•
TxD
PTE0/TxD
MC68HC08GP32
Rev. 6
—
MOTOROLA
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