- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98073 > SAB80C517A-N18-T3 (INFINEON TECHNOLOGIES AG) 8-BIT, 18 MHz, MICROCONTROLLER, PQCC84 PDF資料下載
參數(shù)資料
| 型號： | SAB80C517A-N18-T3 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 18 MHz, MICROCONTROLLER, PQCC84 |
| 封裝： | PLASTIC, LCC-84 |
| 文件頁數(shù)： | 65/137頁 |
| 文件大?。?/td> | 2089K |
| 代理商： | SAB80C517A-N18-T3 |
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頁當(dāng)前第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
Semiconductor Group
4 - 8
4.3
Fast internal Reset after Power-On
The SAB 80C517A can use the oscillator watchdog unit for a fast internal reset procedure after
power-on.
Figure 4-4 shows the power-on sequence under control of the oscillator watchdog.
Normally the devices of the 8051 family (like the SAB 80C517) enter their default reset state not
before the on-chip oscillator starts. The reason is that the external reset signal must be internally
synchronized and processed in order to bring the device into the correct reset state. Especially if a
crystal is used the start up time of the oscillator is relatively long (typ. 1ms). During this time period
the pins have an undefined state which could have severe effects especially to actuators connected
to port pins.
In the SAB 80C517A the oscillator watchdog unit can avoid this situation. For doing this, the
oscillator watchdog must be enabled. In this case, after power-on the oscillator watchdog’s RC
oscillator starts working within a very short start-up time (typ. less than 2 microseconds). In the
following the watchdog circuitry detects a failure condition for the on-chip oscillator because this has
not yet started (a failure is always recognized if the watchdog’s RC oscillator runs faster than the
on-chip oscillator). As long as this condition is detected the watchdog uses the RC oscillator output
as clock source for the chip rather than the on-chip oscillator’s output. This allows correct resetting
of the part and brings also all ports to the defined state (see figure 4-4, I). The time period from
power-on till reaching the reset state at the ports adds from the following terms:
– RC oscillator start-up
< 2
s
– synchronization of the RC oscillators divider-by-5
< 6 T
– synchronization of the state and cycle counters
< 6 T
– reset procedure till correct port states are reached
< 12T
Delay between power-on and correct reset state:
Typ.: 18
s
Max.: 34
s
System Reset
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAB83C517A-N18-T4 | 8-BIT, 18 MHz, MICROCONTROLLER, PQCC84 |
| SAB80C517A-S18-T3 | 8-BIT, 18 MHz, MICROCONTROLLER, PQFP100 |
| SAB83C517A-5S18-T3 | 8-BIT, MROM, 18 MHz, MICROCONTROLLER, PQFP100 |
| SAB83C517A-5S18-T4 | 8-BIT, MROM, 18 MHz, MICROCONTROLLER, PQFP100 |
| SAB80C517A-S18-T3 | 8-BIT, 18 MHz, MICROCONTROLLER, PQFP100 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAB80C517-M | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Single-Chip Microcontroller |
| SAB80C517-M16 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Single-Chip Microcontroller |
| SAB80C517-M-T40/85 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Single-Chip Microcontroller |
| SAB80C517-N | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Single-Chip Microcontroller |
| SAB80C517-N16 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Single-Chip Microcontroller |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。