參數資料
型號： T89C51RD2-SMUCM
廠商： TEMIC SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 0 to 40 MHz Flash Programmable 8-bit Microcontroller
中文描述： 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC68
封裝： PLASTIC, LCC-68
文件頁數： 48/104頁
文件大?。?/td> 798K
代理商： T89C51RD2-SMUCM
48
T89C51RD2
4243G
–
8051
–
05/03
ONCE
(TM)
Mode (ON Chip
Emulation)
The ONCE mode facilitates testing and debugging of systems using T89C51RD2 with-
out removing the circuit from the board. The ONCE mode is invoked by driving certain
pins of the T89C51RD2; the following sequence must be exercised:
Pull ALE low while the device is in reset (RST high) and PSEN is high.
Hold ALE low as RST is deactivated.
While the T89C51RD2 is in ONCE mode, an emulator or test CPU can be used to drive
the circuit. Table 30. shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 30.
External Pin Status during ONCE Mode
(a) "Once" is a registered trademark of Intel Corporation.
ALE
PSEN
Port 0
Port 1
Port 2
Port 3
XTAL1/2
Weak pull-up
Weak pull-up
Float
Weak pull-up
Weak pull-up
Weak pull-up
Active
相關PDF資料
PDF描述
T89C51RD2-SMUIM 0 to 40 MHz Flash Programmable 8-bit Microcontroller
T8 8A TRIACS
T810-600R 8A TRIACS
T810-600R-TR 8A TRIACS
T810-800R 8A TRIACS
相關代理商/技術參數
參數描述
T89C51RD2-SMUC-M 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SMUI-L 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SMUIM 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40 MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SMUI-M 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller
T89C51RD2-SMVC-L 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller
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