參數(shù)資料
型號: DS89C440-QNG
廠商: Maxim Integrated Products
文件頁數(shù): 24/46頁
文件大?。?/td> 0K
描述: IC MCU FLASH 32KB 25MHZ 44-PLCC
標準包裝: 26
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 25MHz
連通性: EBI/EMI,SIO,UART/USART
外圍設備: 電源故障復位,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
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: 管件
DS89C430/DS89C450 Ultra-High-Speed Flash Microcontrollers
30 of 46
Figure 10. Page Mode 1, External Memory Cycle (CD1:CD0 = 10)
Internal Memory Cycles
XTAL1
ALE
Port 0
Port 2
Data
Inst
MSB
LSB
Inst
External Memory Cycles
Page Miss
Page Hit
Page Miss
Data Access
PAGES=00
ALE
PSEN
MOVX
Inst
Data
Page Miss
Data Access
Page Hit
MSBAdd
LSB Add
MSBAdd
LSB Add
PAGES=01
Port 0
Port 2
MSBAdd
LSB Add
Inst
Data
Port 2
Port 0
PSEN
ALE
Page Miss
Data Access
RD/WR
RD
/WR
PAGES=10
RD
/WR
MOVX MOVX
LSB
PSEN
MOVX executed
next instruction
During a page miss, P2 drives the Addr [8:15] of the 16-bit address and holds it for the duration of the first half of
the memory cycle to allow the external address latches to latch the new most significant address byte. ALE is
asserted to strobe the external address latches. During this operation, PSEN, RD, and WR are held in inactive
states and P0 is in a high-impedance state. The following half-memory cycle is executed as a page hit cycle and
the appropriate operation takes place.
A page miss can occur at set intervals or during external operations that require a memory access into a page of
memory that has not been accessed during the last external cycle. Generally, the first external memory access
causes a page miss. The new page address is stored internally and is used to detect a page miss for the current
external memory cycle.
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相關代理商/技術參數(shù)
參數(shù)描述
DS89C440-QNL 功能描述:IC MCU FLASH 32KB 33MHZ 44-PLCC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:89C 產品培訓模塊: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)轉換器:- 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件
DS89C440-QNL+ 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Ultra-High-Speed Flash Microcontrollers
DS89C440-XXX 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Ultra-High-Speed Flash Microcontrollers
DS89C450 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Ultra-High-Speed Flash Microcontrollers
DS89C450+ENG 制造商:Maxim Integrated Products 功能描述:MCU 8BIT CISC 64KB FLASH 5V 44TQFP - Trays