- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄371050 > MC68HC11E20CFN2 (MOTOROLA INC) Microcontrollers PDF資料下載
參數(shù)資料
| 型號： | MC68HC11E20CFN2 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Microcontrollers |
| 中文描述： | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC52 |
| 封裝： | PLASTIC, LCC-52 |
| 文件頁數(shù)： | 121/268頁 |
| 文件大小： | 3696K |
| 代理商： | MC68HC11E20CFN2 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁當前第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁第206頁第207頁第208頁第209頁第210頁第211頁第212頁第213頁第214頁第215頁第216頁第217頁第218頁第219頁第220頁第221頁第222頁第223頁第224頁第225頁第226頁第227頁第228頁第229頁第230頁第231頁第232頁第233頁第234頁第235頁第236頁第237頁第238頁第239頁第240頁第241頁第242頁第243頁第244頁第245頁第246頁第247頁第248頁第249頁第250頁第251頁第252頁第253頁第254頁第255頁第256頁第257頁第258頁第259頁第260頁第261頁第262頁第263頁第264頁第265頁第266頁第267頁第268頁
Serial Communications Interface (SCI)
SCI Error Detection
M68HC11E Family — Rev. 5
Data Sheet
MOTOROLA
Serial Communications Interface (SCI)
For More Information On This Product,
Go to: www.freescale.com
121
7.5.2 Address-Mark Wakeup
The serial characters in this type of wakeup consist of seven (eight if M = 1)
information bits and an MSB, which indicates an address character (when set to 1,
or mark). The first character of each message is an addressing character (MSB =
1). All receivers in the system evaluate this character to determine if the remainder
of the message is directed toward this particular receiver. As soon as a receiver
determines that a message is not intended for it, the receiver activates the RWU
function by using a software write to set the RWU bit. Because setting RWU inhibits
receiver-related flags, there is no further software overhead for the rest of this
message.
When the next message begins, its first character has its MSB set, which
automatically clears the RWU bit and enables normal character reception. The first
character whose MSB is set is also the first character to be received after wakeup
because RWU gets cleared before the stop bit for that frame is serially received.
This type of wakeup allows messages to include gaps of idle time, unlike the
idle-line method, but there is a loss of efficiency because of the extra bit time for
each character (address bit) required for all characters.
7.6 SCI Error Detection
Three error conditions – SCDR overrun, received bit noise, and framing – can
occur during generation of SCI system interrupts. Three bits (OR, NF, and FE) in
the serial communications status register (SCSR) indicate if one of these error
conditions exists.
The overrun error (OR) bit is set when the next byte is ready to be transferred from
the receive shift register to the SCDR and the SCDR is already full (RDRF bit is
set). When an overrun error occurs, the data that caused the overrun is lost and
the data that was already in SCDR is not disturbed. The OR is cleared when the
SCSR is read (with OR set), followed by a read of the SCDR.
The noise flag (NF) bit is set if there is noise on any of the received bits, including
the start and stop bits. The NF bit is not set until the RDRF flag is set. The NF bit
is cleared when the SCSR is read (with FE equal to 1) followed by a read of the
SCDR.
When no stop bit is detected in the received data character, the framing error (FE)
bit is set. FE is set at the same time as the RDRF. If the byte received causes both
framing and overrun errors, the processor only recognizes the overrun error. The
framing error flag inhibits further transfer of data into the SCDR until it is cleared.
The FE bit is cleared when the SCSR is read (with FE equal to 1) followed by a read
of the SCDR.
F
Freescale Semiconductor, Inc.
n
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC68HC11E0 | 8-channel, 8-bit analog-to-digital (A/D) converter |
| MC68HC11E1 | 8-channel, 8-bit analog-to-digital (A/D) converter |
| MC68HC11E9 | 8-channel, 8-bit analog-to-digital (A/D) converter |
| MC68HC11K4 | 8-channel, 8-bit analog-to-digital (A/D) converter |
| MC68HC711E20 | 8-channel, 8-bit analog-to-digital (A/D) converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC11E20CFN3 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:8-channel, 8-bit analog-to-digital (A/D) converter |
| MC68HC11E20CFU2 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
| MC68HC11E20CFU3 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:8-channel, 8-bit analog-to-digital (A/D) converter |
| MC68HC11E20FN3 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
| MC68HC11E20FU3 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:8-channel, 8-bit analog-to-digital (A/D) converter |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。