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AT89C5131-RDTIL Folha de dados(PDF) 151 Page - ATMEL Corporation

Nome de Peças AT89C5131-RDTIL
Descrição Electrónicos  8-bit Flash Microcontroller with Full Speed USB Device
PDF  176 Pages
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Fabricante Electrônico  ATMEL [ATMEL Corporation]
Página de início  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5131-RDTIL Folha de dados(HTML) 151 Page - ATMEL Corporation

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AT89C5131
4136B–USB–09/03
ONCE Mode (ON
Chip Emulation)
The ONCE mode facilitates testing and debugging of systems using AT89C5131 without
removing the circuit from the board. The ONCE mode is invoked by driving certain pins
of the AT89C5131; 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 AT89C5131 is in ONCE mode, an emulator or test CPU can be used to drive
the circuit Table 109 shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 109. External Pin Status during ONCE Mode
ALE
PSEN
Port 0
Port 1
Port 2
Port 3
Port I2
XTALA1/2
XTALB1/2
Weak
pull-up
Weak
pull-up
Float
Weak
pull-up
Weak
pull-up
Weak
pull-up
Float
Active
Active



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