參數(shù)資料
型號： TS80C51RA2-VCJD
廠商： Atmel Corp.
英文描述： High Performance 8-bit Microcontrollers
中文描述： 高性能8位微控制器
文件頁數(shù)： 48/74頁
文件大?。?/td> 903K
代理商： TS80C51RA2-VCJD
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PDF資料
PDF描述
TS80C51RA2-VCJR High Performance 8-bit Microcontrollers
TS80C51RA2-MIAB High Performance 8-bit Microcontrollers
TS80C51RA2-MIAD High Performance 8-bit Microcontrollers
TS80C51RA2-MIAR High Performance 8-bit Microcontrollers
TS80C51RA2-LIBB High Performance 8-bit Microcontrollers
相關代理商/技術參數(shù)
參數(shù)描述
TS80C51RA2-VCJR 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers
TS80C51RA2-VCKB 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers
TS80C51RA2-VCKD 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers
TS80C51RA2-VCKR 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers
TS80C51RA2-VCLB 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers
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