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AT80C51RA2-3CSCL bảng dữ liệu(PDF) 48 Page - International Rectifier

tên linh kiện AT80C51RA2-3CSCL
Giải thích chi tiết về linh kiện  High Performance 8-bit Microcontroller
PDF  85 Pages
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AT80C51RA2-3CSCL bảng dữ liệu(HTML) 48 Page - International Rectifier

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4188E–8051–08/06
AT/TS8xC51Rx2
6.9
ONCETM Mode (ON Chip Emulation)
The ONCE mode facilitates testing and debugging of systems using TS8xC51Rx2 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 cir-
cuit Table 26. shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 6-23.
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



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