MC68HC908GP20 Datasheet, PDF (248/406 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

18.9 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269
18.9.1 SCI Control Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . .269
18.9.2 SCI Control Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . .272
18.9.3 SCI Control Register 3 . . . . . . . . . . . . . . . . . . . . . . . . . . .275
18.9.4 SCI Status Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278
18.9.5 SCI Status Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282
18.9.6 SCI Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .283
18.9.7 SCI Baud Rate Register . . . . . . . . . . . . . . . . . . . . . . . . . . 284
18.2 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.
18.3 Features
Features of the SCI module include:
• 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
Advance Information
248
MC68HC908GP20 — Rev 2.1
Freescale Semiconductor