MC68HC08XL36 Datasheet, PDF (252/362 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
SCI
I/O Signals
TxD
(Transmit Data)
RxD
(Receive Data)
Port E shares two of its pins with the SCI module. The two SCI I/O pins
are:
• TxD — Transmit data
• RxD — Receive data
The TxD pin is the serial data output from the SCI transmitter. The SCI
shares the TxD pin with port E. When the SCI is enabled, the TxD pin is
an output regardless of the state of the DDRE2 bit in data direction
register E (DDRE).
The RxD pin is the serial data input to the SCI receiver. The SCI shares
the RxD pin with port E. When the SCI is enabled, the RxD pin is an input
regardless of the state of the DDRE1 bit in data direction register E
(DDRE).
I/O Registers
The following I/O registers control and monitor SCI operation:
• SCI control register 1 (SCC1)
• SCI control register 2 (SCC2)
• SCI control register 3 (SCC3)
• SCI status register 1 (SCS1)
• SCI status register 2 (SCS2)
• SCI data register (SCDR)
• SCI baud rate register (SCBR)
MC68HC08XL36
252
Serial Communications Interface Module (SCI)
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