參數(shù)資料
型號: TS83C51RB2ZZZ-LCEB
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 30 MHz, MICROCONTROLLER, PQFP44
封裝: 1.40 MM HEIGHT, VQFP-44
文件頁數(shù): 43/74頁
文件大?。?/td> 689K
代理商: TS83C51RB2ZZZ-LCEB
48
Rev. C - 06 March, 2001
TS80C51RA2/RD2
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
6.11. ONCETM 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
Float
Weak pull-up
Active
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