Freescale Semiconductor, Inc.
Advance Information — 68HC(9)12D60
Section 15. Multiple Serial Interface
15.1 Contents
15.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .237
15.3 Block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .238
15.4 Serial Communication Interface (SCI) . . . . . . . . . . . . . . . . . .238
15.5 Serial Peripheral Interface (SPI). . . . . . . . . . . . . . . . . . . . . . .250
15.6 Port S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .260
15.2 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.
68HC(9)12D60 — Rev 4.0
MOTOROLA
Advance Information
Multiple Serial Interface
237
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