mc68hc912bc32 Freescale Semiconductor, Inc, mc68hc912bc32 Datasheet - Page 191

• Manufacturer Part Number: mc68hc912bc32
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 14
Serial Interface
14.1 Introduction
Each serial pin shares function with the general-purpose port pins of port S. The SCI is an NRZ
(non-return to zero) type system that is compatible with standard RS-232 systems. The SCI system has
a 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.
Freescale Semiconductor
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The serial interface of the MCU consists of two independent serial input/output (I/O) subsystems:
Serial communication interface (SCI)
Serial peripheral interface (SPI)
INTERFACE
SERIAL
Figure 14-1. Serial Interface Block Diagram
M68HC12B Family Data Sheet, Rev. 9.1
SCI
SPI
I/O
MOSI/MOMI
MISO/SISO
CS/SS
SCK
RxD
TxD
I/O
I/O
PS0
PS1
PS2
PS3
PS4
PS5
PS6
PS7
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