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參數資料
| 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： | 5/59頁 |
| 文件大?。?/td> | 539K |
| 代理商： | DS89C420-ECL |
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DS89C420
5 of 59
PIN
PLCC
2–9
DIP
1–8
TQFP
40–44
1
2
3
NAME
FUNCTION
P1.0–P1.7
Port 1, I/O.
Port 1 functions as both an 8-bit, bidirectional I/O
port and an alternate functional interface for timer 2 I/O, new
external interrupts, and new serial port 1. The reset condition of
port 1 is with all bits at a logic 1. In this state, a weak pullup
holds the port high. This condition also serves as an input state,
since any external circuit that writes to the port overcomes the
weak pullup. When software writes a 0 to any port pin, the
DS89C420 activates a strong pulldown that remains on until
either a 1 is written or a reset occurs. Writing a 1 after the port
has been at 0 causes a strong transition driver to turn on,
followed by a weaker sustaining pullup. Once the momentary
strong driver turns off, the port again becomes the output high
(and input) state. The alternate functions of Port 1 are outlined
below.
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
9
40
41
42
43
44
1
2
3
PORT
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
ALTERNATE FUNCTION
T2 External I/O for Timer/Counter2
T2EX Timer 2 Capture/Reload Trigger
RXD1 Serial Port 1 Receive
TXD1 Serial Port 1 Transmit
INT2 External Interrupt 2 (Positive Edge Detect)
INT3
External Interrupt 3 (Negative Edge Detect)
INT4 External Interrupt 4 (Positive Edge Detect)
INT5
External Interrupt 5 (Negative Edge Detect)
21
22
23
24
25
26
27
28
24
25
26
27
28
29
30
31
18
19
20
21
22
23
24
25
P2.0 (A8)
P2.1 (A9)
P2.2 (A10)
P2.3 (A11)
P2.4 (A12)
P2.5 (A13)
P2.6 (A14)
P2.7 (A15)
Port 2 (A8–15), I/O.
Port 2 is an 8-bit, bidirectional I/O port.
The reset condition of port 2 is logic high. In this state, a weak
pullup holds the port high. This condition also serves as an
input mode, since any external circuit that writes to the port
overcomes the weak pullup. When software writes a 0 to any
port pin, the DS89C420 activates a strong pulldown that
remains on until either a 1 is written or a reset occurs. Writing a
1 after the port has been at 0 causes a strong transition driver to
turn on, followed by a weaker sustaining pullup. Once the
momentary strong driver turns off, the port again becomes both
the output high and input state. As an alternate function, port 2
can function as the MSB of the external address bus when
reading external program memory and read/write external
RAM or peripherals. In page mode 1, port 2 provides both the
MSB and LSB of the external address bus; in page mode 2, it
provides the MSB and data.
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| DS89C420-MCL | Ultra-High-Speed Microcontroller |
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| DS9097 | COM Port Adapter |
| DS9097E | COM Port Adapter |
| DS9098P | iButton Retainer |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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: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 數據轉換器:- 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 |
| 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: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 數據轉換器:- 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 |
| 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: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 數據轉換器:- 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 |
| 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: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 數據轉換器:- 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 |
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