- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄10941 > MCHC11F1VFNE3 (Freescale Semiconductor)MCU 8BIT 1KRAM 512EE 68-PLCC PDF資料下載
參數(shù)資料
| 型號： | MCHC11F1VFNE3 |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 149/158頁 |
| 文件大小： | 0K |
| 描述： | MCU 8BIT 1KRAM 512EE 68-PLCC |
| 標準包裝： | 18 |
| 系列： | HC11 |
| 核心處理器： | HC11 |
| 芯體尺寸： | 8-位 |
| 速度： | 3MHz |
| 連通性： | SCI，SPI |
| 外圍設(shè)備： | POR，WDT |
| 輸入/輸出數(shù)： | 30 |
| 程序存儲器類型： | ROMless |
| EEPROM 大?。?/td> | 512 x 8 |
| RAM 容量： | 1K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 4.75 V ~ 5.25 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 8x8b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 105°C |
| 封裝/外殼： | 68-LCC（J 形引線） |
| 包裝： | 管件 |
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頁當前第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
SERIAL COMMUNICATIONS INTERFACE
MC68HC11F1
7-4
TECHNICAL DATA
7.4 Wakeup Feature
The wakeup feature reduces SCI service overhead in multiple receiver systems. Soft-
ware for each receiver evaluates the first character of each message. The receiver is
placed in wakeup mode by writing a one to the RWU bit in the SCCR2 register. While
RWU is one, all of the receiver-related status flags (RDRF, IDLE, OR, NF, and FE) are
inhibited (cannot become set). Although RWU can be cleared by a software write to
SCCR2, to do so would be unusual. Normally RWU is set by software and is cleared
automatically with hardware. Whenever a new message begins, logic alerts the sleep-
ing receivers to wake up and evaluate the initial character of the new message.
Two methods of wakeup are available: idle-line wakeup and address-mark wakeup.
During idle-line wakeup, a sleeping receiver awakens as soon as the RxD line be-
comes idle. In the address-mark wakeup, logic one in the most significant bit (MSB) of
a character wakes up all sleeping receivers.
7.4.1 Idle-Line Wakeup
To use the receiver wakeup method, establish a software addressing scheme to allow
the transmitting devices to direct a message to individual receivers or to groups of re-
ceivers. This addressing scheme can take any form as long as all transmitting and re-
ceiving devices are programmed to understand the same scheme. Because the
addressing information is usually the first frame(s) in a message, receivers that are not
part of the current task do not become burdened with the entire set of addressing
frames. All receivers are awake (RWU = 0) when each message begins. As soon as
a receiver determines that the message is not intended for it, software sets the RWU
bit (RWU = 1), which inhibits further flag setting until the RxD line goes idle at the end
of the message. As soon as an idle line is detected by receiver logic, hardware auto-
matically clears the RWU bit so that the first frame of the next message can be re-
ceived. This type of receiver wakeup requires a minimum of one idle-line frame time
between messages, and no idle time between frames in a message.
7.4.2 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 one, or mark).
The first character of each message is an addressing character (MSB = 1). All receiv-
ers 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 soft-
ware 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 al-
lows 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.
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SPC5515SAMLU66 | MCU POWERPC 768K FLASH 176-LQFP |
| MCF5214CVM66 | IC MPU 32BIT COLDF 256-MAPBGA |
| SPC5604PEF0MLQ6 | IC MCU 32BIT 512KB FLASH 144LQFP |
| EGG.1B.308.CYM | CONN RCPT 8POS PNL MNT SKT W/NUT |
| MC68HC16Z1CEH16 | IC MCU 16BIT 16MHZ 132-PQFP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCHC11KS1CFNE4 | 功能描述:8位微控制器 -MCU 68HC11KS4 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| MCHC175AFR1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MCHC40-330K-RC | 制造商:ALLIED 制造商全稱:Allied Components International 功能描述:Molded Chip Inductor High Current |
| MCHC705B16NCFNE | 功能描述:IC MCU 8BIT 352 BYTES RAM 52PLCC RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 標準包裝:1 系列:87C 核心處理器:MCS 51 芯體尺寸:8-位 速度:16MHz 連通性:SIO 外圍設(shè)備:- 輸入/輸出數(shù):32 程序存儲器容量:8KB（8K x 8） 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4 V ~ 6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:外部 工作溫度:0°C ~ 70°C 封裝/外殼:44-DIP 包裝:管件 其它名稱:864285 |
| MCHC705B16NVFNE | 功能描述:IC MCU 8BIT 15K OTP 52-PLCC RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 標準包裝:1 系列:87C 核心處理器:MCS 51 芯體尺寸:8-位 速度:16MHz 連通性:SIO 外圍設(shè)備:- 輸入/輸出數(shù):32 程序存儲器容量:8KB（8K x 8） 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4 V ~ 6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:外部 工作溫度:0°C ~ 70°C 封裝/外殼:44-DIP 包裝:管件 其它名稱:864285 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。