MC68HC812A4 Datasheet, PDF (213/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

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Section 13. Multiple Serial Interface (MSI)
13.1 Contents
13.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .213
13.3 SCI Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214
13.4 SPI Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .215
13.5 MSI Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .215
13.6 MSI Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .216
13.7 General-Purpose I/O Ports . . . . . . . . . . . . . . . . . . . . . . . . . . .218
13.7.1 Port S Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . .219
13.7.2 Port S Data Direction Register . . . . . . . . . . . . . . . . . . . . . .220
13.7.3 Port S Pullup and Reduced Drive Control . . . . . . . . . . . . .221
13.7.4 Port S Wired-OR Mode Control . . . . . . . . . . . . . . . . . . . . .222
13.2 Introduction
The multiple serial interface (MSI) module consists of three independent
serial I/O interfaces:
• Two serial communication interfaces, SCI0 and SCI1
• One serial peripheral interface, SPI0
NOTE: Port S shares its pins with the multiple serial interface (MSI).
See 13.7 General-Purpose I/O Ports.
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MOTOROLA
Multiple Serial Interface (MSI)
MC68HC812A4 — Rev. 3.0
213