MC68HC11P2 Datasheet, PDF (87/268 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Technical Data — MC68HC11P2
Section 5. Serial Communications Interface (SCI)
5.1 Contents
5.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
5.3 Data format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
5.4 Transmit operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
5.5 Receive operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
5.6 Wakeup feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
5.7 SCI error detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
5.8 SCI registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
5.9 Status flags and interrupts . . . . . . . . . . . . . . . . . . . . . . . . . 101
5.10 Additional SCI subsystems . . . . . . . . . . . . . . . . . . . . . . . . . 104
5.2 Introduction
The serial communications interface (SCI) is a universal asynchronous
receiver transmitter (UART). It has a non-return to zero (NRZ) format
(one start, eight or nine data, and one stop bit) that is compatible with
standard RS-232 systems.
The MC68HC11P2 contains three serial communications interfaces, all
having similar operation. For ease of reference, a full description of SCI1
(PD0/RXD1, PD1/TXD1) is given first, followed by summaries for SCI2
and SCI3, detailing their differences.
MC68HC11P2 — Rev 1.0
Serial Communications Interface (SCI)
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Technical Data