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參數(shù)資料
| 型號(hào)： | DS87C520-QNL/T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 14/43頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU EPROM/ROM 33MH IND 44PLCC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 500 |
| 系列： | 87C |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 33MHz |
| 連通性： | EBI/EMI，SIO，UART/USART |
| 外圍設(shè)備： | 電源故障復(fù)位，WDT |
| 輸入/輸出數(shù)： | 32 |
| 程序存儲(chǔ)器容量： | 16KB（16K x 8） |
| 程序存儲(chǔ)器類型： | OTP |
| RAM 容量： | 1K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 4.5 V ~ 5.5 V |
| 振蕩器型： | 外部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 包裝： | 帶卷 (TR) |
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DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers
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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 4. 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
microcontroller allows 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 mode when performing on-chip memory access. The default state of ALEOFF = 0 so ALE toggles
at a frequency of XTAL/4.
STOP MODE WITH RING STARTUP
STOP MODE WITHOUT RING STARTUP
NOTE: DIAGRAM ASSUMES THAT THE OPERATION FOLLOWING STOP REQUIRES
LESS THAN 18ms TO COMPLETE.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS87C520-QNL | IC MCU EPROM/ROM 33MH IND 44PLCC |
| DS87C520-MNL | IC MCU EPROM/ROM 33MH IND 40-DIP |
| DS87C530-QCL | IC MCU EPR/ROM W/RTC 33MZ 52PLCC |
| VE-2NH-IX-F2 | CONVERTER MOD DC/DC 52V 75W |
| VE-2NH-IX-F1 | CONVERTER MOD DC/DC 52V 75W |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS87C520-WCL | 功能描述:8位微控制器 -MCU EPROM/ROM High-Speed RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| DS87C530 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM MICRO WITH REAL TIME CLOCK |
| DS87C530_05 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM/ROM Microcontrollers with Real-Time Clock |
| DS87C530_1 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM/ROM Micro with Real Time Clock |
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