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參數(shù)資料
| 型號(hào)： | DS83C530-QNL |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Microcontroller |
| 英文描述： | 8-BIT, MROM, 33 MHz, MICROCONTROLLER, PQCC52 |
| 封裝： | PLASTIC, LCC-52 |
| 文件頁(yè)數(shù)： | 17/45頁(yè) |
| 文件大?。?/td> | 649K |
| 代理商： | DS83C530-QNL |
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DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock
24 of 45
The ring oscillator runs at approximately 2MHz to 4MHz but will not be a precise value. Do not conduct
real-time precision operations (including serial communication) during this ring period. Figure 6 shows
how the operation would compare when using the ring, and when starting up normally. The default state
is to exit Stop mode without using the ring oscillator.
The RGSL ring-select bit at EXIF.1 (EXIF; 91h) controls this function. When RGSL = 1, the CPU will
use the ring oscillator to exit Stop mode quickly. As mentioned above, the processor will automatically
switch from the ring to the crystal after a delay of 65,536 crystal clocks. For a 3.57MHz crystal, this is
approximately 18ms. The processor sets a flag called RGMD- Ring Mode, located at EXIF.2, that tells
software that the ring is being used. The bit will be a logic 1 when the ring is in use. Attempt no serial
communication or precision timing while this bit is set, since the operating frequency is not precise.
Figure 6. Ring Oscillator Exit from Stop Mode
EMI REDUCTION
One of the major contributors to radiated noise in an 8051-based system is the toggling of ALE. The
DS87C530/DS83C530 allow software to disable ALE when not used by setting the ALEOFF (PMR.2) bit
to 1. When ALEOFF = 1, ALE will still toggle during an off-chip MOVX. However, ALE will remain in
a static when performing on-chip memory access. The default state of ALEOFF = 0 so ALE toggles with
every instruction cycle.
NOTE: DIAGRAM ASSUMES THAT THE OPERATION FOLLOWING STOP REQUIRES LESS THAN 18ms TO COMPLETE.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS87C530-QNL | 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, PQCC52 |
| DS83C530-QCL | 8-BIT, MROM, 33 MHz, MICROCONTROLLER, PQCC52 |
| DS87C530-KCL | 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, CQCC52 |
| DTA-03D-1.5-TA-P | POSITION, LINEAR SENSOR-AC, -3-3mm |
| DTA-01D-3-SA-P | POSITION, LINEAR SENSOR-AC, -1-1mm |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS83C530-QNL+ | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM/ROM Microcontrollers with Real-Time Clock |
| DS83CH20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral (Multifunction) Controller |
| DS84 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| DS840 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| DS843 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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