- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄367741 > P83C557E4 (NXP Semiconductors N.V.) Single-chip 8-bit microcontroller(單片8位微控制器) PDF資料下載
參數(shù)資料
| 型號： | P83C557E4 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Single-chip 8-bit microcontroller(單片8位微控制器) |
| 中文描述： | 單芯片8位微控制器（單片8位微控制器） |
| 文件頁數(shù)： | 46/72頁 |
| 文件大?。?/td> | 525K |
| 代理商： | P83C557E4 |
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頁當前第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
Philips Semiconductors
Product specification
P83C557E4/P80C557E4/P89C557E4
Single-chip 8-bit microcontroller
1999 Mar 02
46
6.14
The reset input pin RSTIN is connected to a Schmitt trigger for noise
reduction (see Figure 46). Is the HF-oscillator selected a Reset is
accomplished by holding the RSTIN pin HIGH for at least 2 machine
cycles (24 system clock periods). Is the PLL-oscillator selected the
RSTIN-pulse must have a width of 1
μ
s at least, independent of the
32 kHz-oscillator is running or not (see PLL description). The CPU
responds by executing an internal reset. The RSTOUT pin
represents the signal resetting the CPU and can be used to reset
peripheral devices.
Reset Circuitry
The RSTOUT level also could be high due to a Watchdog timer
overflow.
The length of the output pulse from T3 is 3 machine cycles. A pulse
of such short duration is necessary in order to recover from a
processor or system fault as fast as possible.
During Reset, ALE and PSEN output a HIGH level. In order to
perform a correct reset, this level must not be affected by external
elements.
A Reset leaves the internal registers as shown in Table 5.
The internal RAM is not affected by Reset. At power-on, the RAM
content is indeterminate.
6.15
An automatic Reset can be obtained by switching on V
DD
, if the
RSTIN pin is connected to V
DD
via a capacitor, as shown in
Figure 47.
Power-on Reset
Is the HF oscillator selected the V
DD
rise time must not exceed 10
ms and the capacitor should be at least 2.2
μ
F. The decrease of the
RSTIN pin voltage depends on the capacitor and the internal resistor
R
RST
. That voltage must remain above the lower threshold for at
minimum the HF-oscillator start-up time plus 2 machine cycles. Is
the PLL-oscillator selected a 0.1
μ
F capacitor is sufficient to obtain
an automatic reset.
8xC557E4
V
DD
RST
R
RST
HF-Osc.: 2.2
μ
F
PLL-Osc.: 0.1
μ
F
V
DD
Figure 46. On-chip Reset Configuration
R
RST
RSTIN
Schmitt
Trigger
On-chip
resistor
Overflow
timer T3
Figure 47. Power-on Reset
MUX
RSTOUT
Internal
Reset
SELXTAL1
PLL
OSC
Capacitor for
相關PDF資料 |
PDF描述 |
|---|---|
| P80C557E4 | Single-chip 8-bit microcontroller(單片8位微控制器) |
| P89C557E6 | Single-chip 8-bit microcontroller(單片8位微控制器) |
| P80C557E6 | Single-chip 8-bit microcontroller(單片8位微控制器) |
| P89C58 | 80C51 8-bit microcontroller family 4K/8K/16K/32K Flash |
| P89C54X2 | 80C51 8-bit Flash microcontroller family |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| P83C557E4EBB | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller |
| P83C557E4EBB/YYY | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| P83C557E4EFB | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller |
| P83C557E4EFB/YYY | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| P83C557E6 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller |
發(fā)布緊急采購，3分鐘左右您將得到回復。