參數資料
型號: DS89C420
英文描述: Ultra-High-Speed Microcontroller
中文描述: 超高速微控制器
文件頁數: 6/59頁
文件大?。?/td> 539K
代理商: DS89C420
DS89C420
6 of 59
PIN
PLCC
11, 13–
19
DIP
10–17
TQFP
5, 7–13
NAME
FUNCTION
P3.0–P3.7
Port 3, I/O.
Port 3 functions as both an 8-bit, bidirectional I/O
port and an alternate functional interface for external interrupts,
serial port 0, timer 0 and 1 inputs, and
RD
and
WR
strobes. The
reset condition of port 3 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 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. The alternate modes of Port 3
are outlined below.
10
11
12
13
14
15
16
17
31
11
13
14
15
16
17
18
19
35
5
7
8
9
10
11
12
13
29
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
PORT
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
ALTERNATE FUNCTION
RXD0 Serial Port 0 Receive
TXD0 Serial Port 0 Transmit
INT0
External Interrupt 0
INT1
External Interrupt 1
T0
Timer 0 External Input
T1
Timer 1 External Input
WR
External Data Memory Write Strobe
P3.7
RD
External Data Memory Read Strobe
EA
External Access.
Allows selection of internal or external
program memory. Connect to ground to force the DS89C420 to
use an external memory-program memory. The internal RAM
is still accessible as determined by register settings. Connect to
V
CC
to use internal flash memory.
相關PDF資料
PDF描述
DS89C420-ECL Ultra-High-Speed Microcontroller
DS89C420-MCL Ultra-High-Speed Microcontroller
DS9094 iButtonTM Clip
DS9097 COM Port Adapter
DS9097E COM Port Adapter
相關代理商/技術參數
參數描述
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-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