MC908JB16DWE Datasheet, PDF (208/332 Pages) Freescale Semiconductor, Inc – Microcontrollers

Serial Communications Interface
12.8.2 RxD (Receive Data) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
12.9 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
12.9.1 SCI Control Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
12.9.2 SCI Control Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232
12.9.3 SCI Control Register 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
12.9.4 SCI Status Register 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
12.9.5 SCI Status Register 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
12.9.6 SCI Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
12.9.7 SCI Baud Rate Register . . . . . . . . . . . . . . . . . . . . . . . . . . .244
12.2 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.
12.3 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
• Baud rate clock source is OSCDCLK (2 × OSCXCLK)
Technical Data
208
Serial Communications Interface Module (SCI)
MC68HC908JB16 — Rev. 1.1
Freescale Semiconductor