13. ONCETM Mode (ON Chip Emulation) The ONCE " />
33
4431E–8051–04/06
AT/TS8xC54/8X2
13. ONCETM Mode (ON Chip Emulation)
The ONCE mode facilitates testing and debugging of systems using TS80C54/58X2 without
removing the circuit from the board. The ONCE mode is invoked by driving certain pins of the
TS80C54/58X2; 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 TS80C54/58X2 is in ONCE mode, an emulator or test CPU can be used to drive the
circuit Table 13-1 shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 13-1.
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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