參數(shù)資料
型號(hào)： DS87C550
廠商： Maxim Integrated Products, Inc.
英文描述： EPROM High-Speed Micro with A/D and PWM(帶 A/D 和 PWM的EPROM/ROM高速微控制器)
中文描述： 存儲(chǔ)器高速微與A / D及PWM（帶A / D轉(zhuǎn)換和脈寬調(diào)制的存儲(chǔ)器/ ROM的高速微控制器）
文件頁(yè)數(shù)： 11/27頁(yè)
文件大小： 119K
代理商： DS87C550
APPLICATION NOTE 78
030998 11/27
ADVANTAGES OF RING OSCILLATOR
Figure 6
CRYSTAL
uC OPERATING
uC OPERATING
STOP MODE WITHOUT RING STARTUP
RING
INTx
POWER
uC HALTED
uC HALTED
ENMODE
EMODE
CLOCK
ENMODE
WARM UP
1
1. Crystal Warm up period is 4 to 10 ms depending on crystal type and speed.
éééééééé
éééééééé
CRYSTAL
STOP MODE WITH RING STARTUP
RING
INTx
POWER
uC HALTED
uC HALTED
ENMODE
EMODE
ENMODE
uC OPERATING
1
POWER SAVED
2
1. Diagram assumes that the operation following Stop requires less than 18 ms to complete.
2. Additional power savings due to decreased ring oscillation current compared to crystal amplifier.
Even if timing–dependent functions are necessary
shortly after resuming Stop mode, the ring oscillator
may be beneficial. Typically there is some processing
that is necessary along with a timing routine or serial
port transmission. Prior to executing the Stop com-
mand, the device should switch to the crystal as the
clock source and set the RGSL bit. Upon resuming from
Stop, the device can execute code while running from
the ring oscillator in preparation for the timing depen-
dent operation. The device can then loop until the
RGMD bit has been cleared, indicating that the crystal
or external clock source is now the clock source, and
timing dependent operations can begin.
CLOCK CONTROL BITS
There are a number of bits that are used to configure the
clock management modes of the DS87C5x0. These
allow the system to switch between different clock
sources, indicate the current status of the clock source,
and select how the device will resume from Stop mode.
The pertinent bits are shown in Table 3.
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參數(shù)描述
DS87C550-FCL 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM
DS87C550-FNL 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM
DS87C550-KCL 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM
DS87C550-QCL 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM
DS87C550-QCL+ 功能描述:IC MCU EPROM ADC/PWM HS 68-PLCC RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:87C 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設(shè)備:LED，POR，WDT 輸入/輸出數(shù):9 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件
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