参数资料
型号: MC68HC05C8AMFB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44
封装: QFP-44
文件页数: 59/116页
文件大小: 781K
代理商: MC68HC05C8AMFB
MC68HC05C8A MC68HCL05C8A MC68HSC05C8A Data Sheet, Rev. 5.1
Freescale Semiconductor
47
Chapter 9
Serial Communications Interface (SCI)
9.1 Introduction
The serial communications interface (SCI) module allows high-speed asynchronous communication with
peripheral devices and other microcontroller units (MCU).
9.2 Features
Features of the SCI module include:
Standard mark/space non-return-to-zero format
Full duplex operation
32 programmable baud rates
Programmable 8-bit or 9-bit character length
Separately enabled transmitter and receiver
Two receiver wakeup methods:
Idle line wakeup
Address mark wakeup
Interrupt-driven operation capability with five interrupt flags:
Transmitter data register empty
Transmission complete
Receiver data register full
Receiver overrun
Idle receiver input
Receiver framing error detection
1/16 bit-time noise detection
9.3 SCI Data Format
The SCI uses the standard non-return-to-zero mark/space data format illustrated in Figure 9-1.
Figure 9-1. SCI Data Format
8-BIT DATA FORMAT
(BIT M IN SCCR1 CLEAR)
9-BIT DATA FORMAT
(BIT M IN SCCR1 SET)
START
BIT
BIT 0
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
STOP
BIT
NEXT
START
BIT
BIT 0
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
START
BIT
STOP
BIT
NEXT
START
BIT
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