- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385274 > DS87C550 (Maxim Integrated Products, Inc.) EPROM High-Speed Micro with A/D and PWM(帶 A/D 和 PWM的EPROM/ROM高速微控制器) PDF資料下載
參數(shù)資料
| 型號： | 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： | 存儲器高速微與A / D及PWM（帶A / D轉(zhuǎn)換和脈寬調(diào)制的存儲器/ ROM的高速微控制器） |
| 文件頁數(shù)： | 27/27頁 |
| 文件大小： | 119K |
| 代理商： | DS87C550 |
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頁當(dāng)前第27頁
APPLICATION NOTE 78
030998 27/27
MOV PMR, #0C1h ; going from /64 to /4 and then from /4 to /1024.
CLR EWDI ;Since we are now in /1024 there is no need
; to go slower, so disable watchdog interrupt.
D1024: POP ACC ;Restore Accumulator.
DONEWDOG: CLR F0 ;Clear activity flag.
MOV TA, #0AAh ;Timed access to clear Watchdog Interrupt flag.
MOV TA, #55h
CLR WDIF
RETI ;Exit
D4TO64: MOV A, STATUS ;Speed is now /4. Change to /64. Because we
ANL A, #0CFh ; are entering PMM, test for activity. Check all
JNZ D1024 ; bits in Status Register except XTUP, and LIP
; because the watchdog interrupt is low priority.
; If any activity bit is set, abort speed change.
MOV PMR, #081h ;There is no activity. Change clock from to /64.
MOV CKCON, #81h ;Change watchdog divide ratio from 2^26 to 2^23.
JMP D1024
BAND–GAP DISABLING
The band–gap reference, used to detect a power failure,
draws approximately 150
μ
A. During Stop mode, this
can be an appreciable amount of the total current
drawn. The DS87C5x0 supports the option of disabling
the band–gap reference, eliminating the associated cur-
rent drain. When disabled, the device loses the ability to
generate a power–fail interrupt or a power–fail reset.
The device will continue to operate until V
CC
drops
below V
RST
, at which time the device will cease opera-
tion. Without the bandgap reference, the device has no
way of detecting an imminent power loss, or performing
an orderly shutdown. When power resumes, the device
will perform a power–on reset.
Setting the Band–Gap Select bit, BGS (EXIF.0) enables
the band–gap reference during Stop mode. The default
or reset condition is with the bit cleared, and the band–
gap disabled during Stop mode. Note that this bit can be
only changed using a timed access write. It has no con-
trol of the reference during full power, PMM, or Idle
modes.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS9503 | ESD Protection Diode with Resistors(帶電阻器的ESD保護二極管) |
| 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 程序存儲器容量:64KB（64K x 8） 程序存儲器類型: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，3分鐘左右您將得到回復(fù)。