参数资料
型号: MC68HCL05C9AFB
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: 133/160页
文件大小: 4128K
代理商: MC68HCL05C9AFB
NON-DISCLOSURE
AGREEMENT
REQUIRED
Serial Communications Interface (SCI)
General Release Specification
MC68HC05C9A Rev. 4.0
Serial Communications Interface (SCI)
9.7 Data Format
Receive data or transmit data is the serial data that is transferred to the
internal data bus from the receive data input pin (RDI) or from the
internal bus to the transmit data output pin (TDO). The non-return-to-
zero (NRZ) data format shown in Figure 9-3 is used and must meet the
following criteria:
The idle line is brought to a logic one state prior to
transmission/reception of a character.
A start bit (logic zero) is used to indicate the start of a frame.
The data is transmitted and received least significant bit first.
A stop bit (logic one) is used to indicate the end of a frame. A
frame consists of a start bit, a character of eight or nine data bits,
and a stop bit.
A break is defined as the transmission or reception of a low (logic
zero) for at least one complete frame time.
Figure 9-3. Data Format
IDLE LINE
012345678
0
STOP START
START
CONTROL BIT M SELECTS
8- OR 9-BIT DATA
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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