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參數(shù)資料
| 型號(hào)： | T89C51RD2-RLTIL |
| 廠商： | ATMEL CORP |
| 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, 25 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | VQFP-44 |
| 文件頁(yè)數(shù)： | 48/104頁(yè) |
| 文件大?。?/td> | 798K |
| 代理商： | T89C51RD2-RLTIL |
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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(guān)PDF資料 |
PDF描述 |
|---|---|
| T89C51RD2-RLTIM | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-RLVCL | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-RLVCM | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-RLVIL | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-RLVIM | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| T89C51RD2-RLTI-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-RLTIM | 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-RLTI-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-RLUC-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-RLUC-M | 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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