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MC68HC912D60A — Rev. 3.1 Technical Data

Freescale Semiconductor Multiple Serial Interface 263

Technical Data — MC68HC912D60A

Section 15. Multiple Serial Interface

15.1 Contents

15.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .263

15.3 Block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .264

15.4 Serial Communication Interface (SCI) . . . . . . . . . . . . . . . . . .264

15.5 Serial Peripheral Interface (SPI). . . . . . . . . . . . . . . . . . . . . . .276

15.6 Port S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .285

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.

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