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| 型號(hào)： | TS80C51RA2-MCER |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | High Performance 8-bit Microcontrollers |
| 中文描述： | 8-BIT, 40 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | 1.40 MM HEIGHT, VQFP-44 |
| 文件頁(yè)數(shù)： | 48/74頁(yè) |
| 文件大?。?/td> | 903K |
| 代理商： | TS80C51RA2-MCER |
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48
Rev. C - 06 March, 2001
TS80C51RA2/RD2
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
6.11. ONCE
TM
Mode (ON Chip Emulation)
The ONCE mode facilitates testing and debugging of systems using TS80C51Rx2 without removing the circuit
from the board. The ONCE mode is invoked by driving certain pins of the TS80C51Rx2; 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 TS80C51Rx2 is in ONCE mode, an emulator or test CPU can be used to drive the circuit Table 26.
shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 25. External Pin Status during ONCE Mode
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 |
|---|---|
| TS80C51RA2-MCJB | High Performance 8-bit Microcontrollers |
| TS80C51RA2-MCJD | High Performance 8-bit Microcontrollers |
| TS80C51RA2-MCKB | High Performance 8-bit Microcontrollers |
| TS80C51RA2-MCKD | High Performance 8-bit Microcontrollers |
| TS80C51RA2-MCKR | High Performance 8-bit Microcontrollers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS80C51RA2-MCJB | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers |
| TS80C51RA2-MCJD | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers |
| TS80C51RA2-MCJR | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers |
| TS80C51RA2-MCKB | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers |
| TS80C51RA2-MCKD | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers |
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