
Serial Communications Interface
Technical Data
MC68HC08AB16A
—
Rev. 2.0
232
Serial Communications Interface Module (SCI)
MOTOROLA
15.8.2
PTE1/RxD (Receive Data) . . . . . . . . . . . . . . . . . . . . . . . . .252
15.9
15.9.1
15.9.2
15.9.3
15.9.4
15.9.5
15.9.6
15.9.7
I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .253
SCI Control Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . .253
SCI Control Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . .256
SCI Control Register 3 . . . . . . . . . . . . . . . . . . . . . . . . . . .259
SCI Status Register 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .261
SCI Status Register 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .265
SCI Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .266
SCI Baud Rate Register. . . . . . . . . . . . . . . . . . . . . . . . . . .267
15.2 Introduction
This section describes the serial communications interface (SCI)
module, which allows high-speed asynchronous communications with
peripheral devices and other MCUs.
NOTE:
References to DMA (direct-memory access) and associated functions
are only valid if the MCU has a DMA module. This MCU does not have
the DMA function. Any DMA-related register bits should be left in their
reset state for normal MCU operation.
15.3 Features
Features of the SCI module include the following:
Full-duplex operation
Standard mark/space non-return-to-zero (NRZ) format
32 programmable baud rates
Programmable 8-bit or 9-bit character length
Separately enabled transmitter and receiver
Separate receiver and transmitter CPU interrupt requests
Programmable transmitter output polarity