參數(shù)資料
型號: TS80C32X2-LCBR
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 30 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 24/56頁
文件大?。?/td> 790K
代理商: TS80C32X2-LCBR
30
Rev.D - 16 November, 2000
TS80C32X2
TS87C52X2
TS80C52X2
6.8 ONCETM Mode (ON Chip Emulation)
The ONCE mode facilitates testing and debugging of systems using TS80C52X2 without removing the circuit from
the board. The ONCE mode is invoked by driving certain pins of the TS80C52X2; the following sequence must
be exercised:
q
Pull ALE low while the device is in reset (RST high) and PSEN is high.
q
Hold ALE low as RST is deactivated.
While the TS80C52X2 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 15. 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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參數(shù)描述
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