- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄363900 > W79E225APG (WINBOND ELECTRONICS CORP) 8-BIT MICROCONTROLLER PDF資料下載
參數(shù)資料
| 型號(hào)： | W79E225APG |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | ROHS COMPLIANT, PLASTIC, LCC-44 |
| 文件頁(yè)數(shù)： | 172/200頁(yè) |
| 文件大小： | 3644K |
| 代理商： | W79E225APG |
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)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)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)第130頁(yè)第131頁(yè)第132頁(yè)第133頁(yè)第134頁(yè)第135頁(yè)第136頁(yè)第137頁(yè)第138頁(yè)第139頁(yè)第140頁(yè)第141頁(yè)第142頁(yè)第143頁(yè)第144頁(yè)第145頁(yè)第146頁(yè)第147頁(yè)第148頁(yè)第149頁(yè)第150頁(yè)第151頁(yè)第152頁(yè)第153頁(yè)第154頁(yè)第155頁(yè)第156頁(yè)第157頁(yè)第158頁(yè)第159頁(yè)第160頁(yè)第161頁(yè)第162頁(yè)第163頁(yè)第164頁(yè)第165頁(yè)第166頁(yè)第167頁(yè)第168頁(yè)第169頁(yè)第170頁(yè)第171頁(yè)當(dāng)前第172頁(yè)第173頁(yè)第174頁(yè)第175頁(yè)第176頁(yè)第177頁(yè)第178頁(yè)第179頁(yè)第180頁(yè)第181頁(yè)第182頁(yè)第183頁(yè)第184頁(yè)第185頁(yè)第186頁(yè)第187頁(yè)第188頁(yè)第189頁(yè)第190頁(yè)第191頁(yè)第192頁(yè)第193頁(yè)第194頁(yè)第195頁(yè)第196頁(yè)第197頁(yè)第198頁(yè)第199頁(yè)第200頁(yè)
Preliminary W79E225A/227A Data Sheet
Publication Release Date: December 14, 2007
- 172 -
Revision A2.0
19. ANALOG-TO-DIGITAL CONVERTER
The ADC contains a digital-to-analog converter (DAC) that converts the contents of a successive
approximation register to a voltage (V
DAC
), which is compared to the analog input voltage (Vin). The
output of the comparator is then fed back to the successive approximation control logic that controls
the successive approximation register. This is illustrated in the figure below.
Figure 19-1: Successive Approximation ADC
19.1 Operation of ADC
A conversion can be initiated by software only or by either hardware or software. The software only
start mode is selected when control bit ADCCON.5 (ADCEX) =0. A conversion is then started by
setting control bit ADCCON.3 (ADCS) to 1. The hardware or software start mode is selected when
ADCCON.5 =1, and a conversion may be started by setting ADCCON.3 = 1 as above or by applying a
rising edge to external pin STADC (P4.0). When a conversion is started by applying a rising edge, a
low level must be applied to STADC for at least one machine cycle followed by a high level for at least
one machine cycle.
User sets ADCS to start converting then ADCS remains high while ADC is converting signal and will
be automatically cleared by hardware when ADC conversion is completed. The end of the 10-bit
conversion is flagged by control bit ADCCON.4 (ADCI). The upper 8 bits of the result are held in
special function register ADCH, and the two remaining bits are held in ADCL.1 (ADC.1) and ADCL.0
(ADC.0). The user may ignore the two least significant bits in ADCL and use the ADC as an 8-bit
converter (8 upper bits in ADCH). In any event, the total actual conversion time is 50 ADC clock input
cycles.
Control bits from ADCCON.0 to ADCCON.2 are used to control an analog multiplexer which selects
one of eight analog channels. An ADC conversion in progress is unaffected by an external or software
ADC start. The result of a completed conversion remains unaffected provided ADCI = logic 1. The
result of a completed conversion (ADCI = logic 1) remains unaffected when entering the idle mode.
The device supports maximum 8 analog input ports. 8 analog input ports share the I/O pins from P1.0
to P1.7. These I/O pins are switched to analog input ports by setting the bits of ADC Input Pin Select
Register (DDIO) to logic 1.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| W79E227A | 8-BIT MICROCONTROLLER |
| W79E227AFG | 8-BIT MICROCONTROLLER |
| W79E227APG | 8-BIT MICROCONTROLLER |
| W79E532 | 8-BIT MICROCONTROLLER |
| W79E532A40DL | 8-BIT MICROCONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W79E226AFG | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-bit Microcontroller |
| W79E226ALG | 制造商:Nuvoton Technology Corp 功能描述:IC MCU 32K EPROM FLASH 48LQFP |
| W79E226APG | 制造商:Nuvoton Technology Corp 功能描述:IC MCU 32K EPROM FLASH 44PLCC |
| W79E227A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-bit Microcontroller |
| W79E227AFG | 制造商:WINBOND 制造商全稱:Winbond 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)。