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)： 25/27頁(yè)
文件大小： 119K
代理商： DS87C550
APPLICATION NOTE 78
030998 25/27
PROGRAM EXAMPLE: SYSTEM MONITOR
The following program illustrates a basic scheme for
operating a device that constantly monitors the state of
a system. It operates similar to the way that a personal
computer manages its power; if no activity is detected in
a specified period of time it switches to the next lower
power saving mode.
The program monitors an peripheral on port 1, and
updates a display mapped into external memory as
needed. The watchdog timer is used to poll the status of
the system, which is indicated by the F0 flag. If there is
no activity before the timer times out, the device will con-
tinue to decrease its speed. Because the watchdog
timer period is affected by the speed of the device, the
watchdog divide ratio is adjusted to keep as constant an
interval as possible. The methods demonstrated could
also be used to detect a spurious switchback caused by
noise on the serial port and return the device to PMM.
PROGRAM EXAMPLE: GRADUAL POWER DOWN
;***************************************************************************
;Program GRADUAL.ASM
;
;This program shows a gradual version of power management. The watchdog timer
;is used to periodically check the F0 flag to see if any activity has
;occurred since the last timer interrupt. If no activity has occurred,
;then the device will switch the clock to the next lower level of operation.
;This example also demonstrates how an external interrupt would be used in
;conjunction with the watchdog timer.
;***************************************************************************
;Register equate table
CKCON equ 8Eh ;Clock Control Register
P1 equ 90h ;Port 1
IE equ 0A8h ;Interrupt Enable Register
PMR equ 0C4h ;Power Management Register
STATUS equ 0C5h ;Status Register
TA equ 0C7h ;Timed Access Register
WDCON equ 0D8h ;Watchdog Control Register
ACC equ 0E0h ;Accumulator
EIE equ 0E8h ;Extended Interrupt Enable Register
OLD_VAL equ 0CDh ;Previous value from external device.
;Note that this location is normally TH2, but
;we are using it for direct register instruction.
;Bit definition table
RWT equ 0D8h ;Reset watchdog timer bit.
F0 equ 0D5h ;General purpose user flag.
WDIF equ 0DBh ;Watchdog interrupt flag.
EWDI equ 0ECh ;Watchdog interrupt enable.
;Definition equate table.
DISPLAY equ 2000h ;External location of display.
cseg at 0 ;Reset vector.
ljmp START
cseg at 63h ;Watchdog Timer Interrupt vector.
相關(guān)PDF資料
PDF描述
DS9503 ESD Protection Diode with Resistors(帶電阻器的ESD保護(hù)二極管)
DSTINIM400 Networked Microcontroller Evaluation Kit
DSTINIS-005 Sockets Evaluation Board
DSTINIS-006 Sockets Evaluation Board
DSTINIS400 Sockets Evaluation Board
相關(guān)代理商/技術(shù)參數(shù)
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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*