MC68HC908AZ60 Datasheet, PDF (203/480 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Serial Communications Interface Module (SCI)
Pin Name Conventions
– Noise Error
– Framing Error
– Parity Error
• Receiver Framing Error Detection
• Hardware Parity Checking
• 1/16 Bit-Time Noise Detection
Pin Name Conventions
The generic names of the SCI input/output (I/O) pins are:
• RxD (receive data)
• TxD (transmit data)
SCI I/O 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 1 shows the full names and the generic names of the SCI I/O
pins.The generic pin names appear in the text of this section.
Table 1. Pin Name Conventions
Generic Pin Names
Full Pin Names
RxD
PTE1/SCRxD
TxD
PTE0/SCTxD
Functional Description
Figure 1 shows the structure of the SCI module. The SCI allows
full-duplex, asynchronous, NRZ serial communication between 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.
3-sci
MOTOROLA
MC68HC908AZ60 — Rev 2.0
Serial Communications Interface Module (SCI)
201