TS80C32X2-LCAB Temic Semiconductors (acquired by ATMEL Corporation), TS80C32X2-LCAB Datasheet - Page 30
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TS80C32X2-LCAB
Manufacturer Part Number
TS80C32X2-LCAB
Description
8-bit CMOS Microcontroller 0-60 MHZ
Manufacturer
Temic Semiconductors (acquired by ATMEL Corporation)
Datasheet
1.TS80C32X2-LCAB.pdf
(54 pages)
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TS80C52X2
6.8 ONCE 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:
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.
30
Weak pull-up
Pull ALE low while the device is in reset (RST high) and PSEN is high.
Hold ALE low as RST is deactivated.
ALE
Weak pull-up
PSEN
Table 15. External Pin Status during ONCE Mode
Port 0
Float
Preliminary
Weak pull-up
Port 1
Weak pull-up
Port 2
Weak pull-up
Port 3
Rev. B - Jan. 25, 1999
XTAL1/2
Active
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