- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄45219 > MC68HC05CJ4FB (MOTOROLA INC) 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44 PDF資料下載
參數(shù)資料
| 型號(hào)： | MC68HC05CJ4FB |
| 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, PQFP44 |
| 封裝： | QFP-44 |
| 文件頁(yè)數(shù)： | 51/114頁(yè) |
| 文件大?。?/td> | 361K |
| 代理商： | MC68HC05CJ4FB |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)當(dāng)前第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)
GENERAL RELEASE SPECIFICATION
MOTOROLA
SERIAL COMMUNICATIONS INTERFACE
MC68HC(7)05CJ4
8-4
Rev. 2.1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
A few definitions will help in understanding the following discussions.
Bit Time
A bit time is the period of time required to serially transmit or receive one bit of
data and is equal to one cycle of the baud rate frequency.
Mark/Space
Standard NRZ format is sometimes called mark/space format where a mark is
a bit time of logic one and a space is a bit time of logic zero.
Start Bit
A start bit is a bit time of logic zero which indicates the beginning of a data frame.
A start bit must begin with a one to zero transition and is preceded by at least
one bit time of logic one.
Stop Bit
A stop bit is one bit time of logic one which indicates the end of a data frame.
Frame
A frame consists of a start bit followed by a specified number of data or
information bits terminated by a stop bit. The number of data or information bits
depends on the format specified and must agree between the transmitting
device and the receiving device. The most common frame format is one start bit
followed by eight data bits (LSB first) terminated by one stop bit for a total of ten
bit times in the frame. This device is also capable of operating in a nine data bit
format as described elsewhere in this specification.
When the receiver is first enabled, by writing a one to the RE bit in the SCCR2
register, the receiver front end logic begins an asynchronous search for a start bit.
The goal of this search is to gain synchronization with a frame. This bit time
synchronization is done at the beginning of each frame so that small differences in
the baud rate of the receiver and transmitter are not cumulative. The circuit also
resynchronizes on all one-to-zero transitions in the serial data stream.
The sequence of events in searching for a start bit is as follows:
1. Sample RXD input during each RT period and maintain these samples in a
serial pipeline.
* if RXD is already low, do not begin the start bit search - go to step 1.
* if RXD is high, look for two more high RT samples before beginning the
start bit search. Stay in step 1 until a total of three consecutive high RT
samples have been received.
2. RXD was low during this RT period and high during the previous three
periods. Consider this sample to be time “RT1 and the official start of the
start bit search.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC68HC05CL48 | 8-BIT, MROM, 1.802 MHz, MICROCONTROLLER, PQFP112 |
| MC68HC705CL48 | 8-BIT, OTPROM, 1.802 MHz, MICROCONTROLLER, PQFP112 |
| MC68HC05CT4FN | 8-BIT, MROM, 2.048 MHz, MICROCONTROLLER, PQCC44 |
| MC68HC05CT4FB | 8-BIT, MROM, 2.048 MHz, MICROCONTROLLER, PQFP44 |
| MC68HC05E16CB | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC05CT4FB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification |
| MC68HC05CT4FN | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification |
| MC68HC05D9 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:8-bit microcomputer with PWM outputs and LED drive |
| MC68HC05E0 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit |
| MC68HC05E0FN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。