參數(shù)資料
型號(hào)： DS89C420
英文描述： Ultra-High-Speed Microcontroller
中文描述： 超高速微控制器
文件頁數(shù)： 30/59頁
文件大小： 539K
代理商： DS89C420
DS89C420
30 of 59
Table 11. Page Mode 2, Data Memory Cycle Stretch Values
(Pages1:Pages0 = 11)
RD
/
WR
PULSE WIDTH (IN NUMBER OF OSCILLATOR CLOCKS)
4X/2X, CD1,
CD0 = 100
CD0 = 000
0.5
1
1
2
2
4
3
6
4
8
5
10
6
12
7
14
MD2:MD0
STRETCH
CYCLES
4X/2X, CD1,
4X/2X, CD1,
CD0 = X10
2
4
8
12
16
20
24
28
4X/2X, CD1,
CD0 = X11
2048
4096
8192
12,288
16,384
20,480
24,576
28,672
000
001
010
011
100
101
110
111
0
1
2
3
7
8
9
10
As shown in the previous tables, the stretch feature supports eight stretched external data-memory access
cycles that can be categorized into three timing groups. When the stretch value is cleared to 000b, there is
no stretch on external data-memory access and a MOVX instruction is completed in two basic memory
cycles. When the stretch value is set to 1, 2, or 3, the external data memory access is extended by 1, 2, or
3 stretch memory cycles, respectively. Note that the first stretch value does not result in adding four
system clocks to the control signals. This is because the first stretch uses one system clock to create
additional address setup and data bus float time, and one system clock to create additional address and
data hold time. When using very slow RAM and peripherals, a larger stretch value (4–7) can be selected.
In this stretch category, two stretch cycles are used to create additional setup (the ALE pulse width is also
stretched by one stretch cycle for page miss) and one stretch cycle is used to create additional hold time.
The following timing diagrams illustrate the external data-memory access at divide by 1 system clock
mode (CD1:CD0 = 10b).
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS89C420_02 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Ultra-High-Speed Microcontroller
DS89C420_05 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Ultra-High-Speed Microcontroller
DS89C420-ECL 功能描述:IC MCU ULTRA 33MHZ 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(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
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(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
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(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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