Freescale Semiconductor, Inc.
Technical Data — MC68HC912DG128
Section 14. Multiple Serial Interface
14.1 Contents
14.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .249
14.3 Block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .250
14.4 Serial Communication Interface (SCI) . . . . . . . . . . . . . . . . . .250
14.5 Serial Peripheral Interface (SPI). . . . . . . . . . . . . . . . . . . . . . .262
14.6 Port S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .271
14.2 Introduction
The multiple serial interface (MSI) module consists of three independent
serial I/O sub-systems: two serial communication interfaces (SCI0 and
SCI1) and the serial peripheral interface (SPI). Each serial pin shares
function with the general-purpose port pins of port S. The SCI
subsystems are NRZ type systems that are compatible with standard
RS-232 systems. These SCI systems have a new single wire operation
mode which allows the unused pin to be available as general-purpose
I/O. The SPI subsystem, which is compatible with the M68HC11 SPI,
includes new features such as SS output and bidirectional mode.
MC68HC912DG128 — Rev 3.0
Technical Data
Multiple Serial Interface
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