參數資料
型號： MC68HCL05C9AFN
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數： 139/162頁
文件大小： 1093K
代理商： MC68HCL05C9AFN
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Serial Communications Interface (SCI)
Advance Information
MC68HC05C9A — Rev. 5.0
78
Serial Communications Interface (SCI)
MOTOROLA
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
these criteria:
The idle line is brought to a logic 1 state prior to transmission/
reception of a character.
A start bit (logic 0) is used to indicate the start of a frame.
The data is transmitted and received least significant bit first.
A stop bit (logic 1) 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 0) for at least one complete frame time.
Figure 9-3. Data Format
9.8 Receiver Wakeup Operation
The receiver logic hardware also supports a receiver wakeup function
which is intended for systems having more than one receiver. With this
function a transmitting device directs messages to an individual receiver
or group of receivers by passing addressing information as the initial
byte(s) of each message. The wakeup function allows receivers not
addressed to remain in a dormant state for the remainder of the
unwanted message. This eliminates any further software overhead to
service the remaining characters of the unwanted message and thus
improves system performance.
IDLE LINE
012345678
0
STOP START
START
CONTROL BIT M SELECTS
8- OR 9-BIT DATA
相關PDF資料
PDF描述
MC68HSC05C9AP 8-BIT, MROM, 4.1 MHz, MICROCONTROLLER, PDIP40
MC68HSC05C9ACP 8-BIT, MROM, 4.1 MHz, MICROCONTROLLER, PDIP40
MC68HC05C9AMP 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP40
MC68HC05C9AMFN 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44
MC68HC05C9AFB 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44
相關代理商/技術參數
參數描述
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