參數(shù)資料
型號: SAB-C502-2R20N
廠商: SIEMENS A G
元件分類: 微控制器/微處理器
英文描述: 8-Bit CMOS Microcontroller
中文描述: 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQCC44
文件頁數(shù): 31/46頁
文件大?。?/td> 567K
代理商: SAB-C502-2R20N
Semiconductor Group
30
C502
Fast Internal Resest after Power-On
The SAB-C502 can use the oscillator watchdog unit for a fast internal resert procedure after power-
on.
Normally members of the 8051 family 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
timed of the oscillator is relatively long (typ. 1 ms). During this time period the pins have an
undefined state which could have severe effects e.g. to actuators connected to port pins.
In the SAB-C502 the oscillator watchdog unit avoids this situation. After power-on the oscillator
watchdog’s RC oscillator starts working within a very short start-up time (typ. less than 2
μ
s). In the
following the watchdog circuitry detects a failure condition for the on-chip oscillator 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 valid the watchdog uses the RC oscillator output as a clock
source for the chip rather than the on-chip oscillator’s 16 output. This allows correct resetting of the
part and brings also all ports to the defined state.
Delay between power-on and correct reset state:
Typ:
18
μ
s
34
μ
s
Max:
相關(guān)PDF資料
PDF描述
SAB-C502-2R20P 8-Bit CMOS Microcontroller
SAB-C502-2RN 8-Bit CMOS Microcontroller
SAB-C502-2RP 8-Bit CMOS Microcontroller
SAB-C502-L20N 8-Bit CMOS Microcontroller
SAF-C502-2R20N 8-Bit CMOS Microcontroller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAB-C502-2R20P 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
SAB-C502-2RN 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
SAB-C502-2RP 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
SAB-C502-L20N 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
SAB-C502-L20P 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller