參數(shù)資料
型號： DS89C420-ECL
英文描述： Ultra-High-Speed Microcontroller
中文描述： 超高速微控制器
文件頁數(shù)： 38/59頁
文件大?。?/td> 539K
代理商： DS89C420-ECL
DS89C420
38 of 59
the multiplier startup counter. During the multiplier startup period the CKRY bit remains cleared and the
CD1 and CD0 clock controls cannot be set to 00b. The CTM bit is cleared to a logic 0 on all resets.
Figure 11 gives a simplified diagram of the generation of the system clocks. Specifics of hardware
restrictions associated with the use of the 4X/
X
2
CTM, CKRY, CD1, and CD0 bits are outlined in the
SFR description.
Figure 11. System Clock Sources
4X/2X
CTM
Crystal
Oscillator
Divide 1024
Ring
Oscillator
Clock
Multiplier
CD0
CD1
Selector
Ring
Enable
MUX
System
Clock
Bandgap-Monitored Interrupt and Reset Generation
The power monitor in the DS89C420 monitors the V
CC
pin in relation to the on-chip bandgap voltage
reference. Whenever V
CC
falls below V
PFW
, an interrupt is generated if the corresponding power-fail
interrupt-enable bit EPFI (WDCON.5) is set, causing the device to vector to address 33h. The power-fail
interrupt-status bit PFI (WDCON.4) is set anytime V
CC
transitions below V
PFW
, and can only be cleared
by software once set. Similarly, as V
CC
falls below V
RST
, a reset is issued internally to halt program
execution. Following power-up, a power-on reset initiates a power-on reset timeout before starting
program execution. When V
CC
is first applied to the DS89C420, the processor is held in reset until
V
CC
> V
RST
and a delay of 65,536 oscillator cycles has elapsed, to ensure that power is within tolerance
and the clock source has had time to stabilize. Once the reset timeout period has elapsed, the reset
condition is removed automatically and software execution begins at the reset vector location of 0000h.
The power-on reset flag POR (WDCON.6) is set to logic 1 to indicate a power-on reset has occurred, and
can only be cleared by software.
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相關代理商/技術參數(shù)
參數(shù)描述
DS89C420-ECS 功能描述:IC MCU 50MHZ ULTRA HS 44-TQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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
DS89C420-ENG 功能描述:IC MCU ULTRA 25MHZ HP 44-TQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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
DS89C420-ENL 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Ultra-High-Speed Microcontroller
DS89C420-MCL 功能描述:IC MCU ULTRA 33MHZ HP 40-DIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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
DS89C420-MCS 功能描述:IC MCU 50MHZ ULTRA HS 40-DIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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
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