MC908AB32CFUE Datasheet, PDF (240/392 Pages) Freescale Semiconductor, Inc – Microcontrollers

Serial Communications Interface
15.8.2 PTE1/RxD (Receive Data) . . . . . . . . . . . . . . . . . . . . . . . . . 260
15.9 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
15.9.1 SCI Control Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
15.9.2 SCI Control Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
15.9.3 SCI Control Register 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . 267
15.9.4 SCI Status Register 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269
15.9.5 SCI Status Register 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
15.9.6 SCI Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
15.9.7 SCI Baud Rate Register . . . . . . . . . . . . . . . . . . . . . . . . . . .275
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
Technical Data
240
MC68HC908AB32 — Rev. 1.1
Serial Communications Interface Module (SCI)
Freescale Semiconductor