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AT89C51ED2-RDTIM Datasheet(PDF) 84 Page - ATMEL Corporation

No. de pieza AT89C51ED2-RDTIM
Descripción Electrónicos  8-bit Flash Microcontroller
PDF  137 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ED2-RDTIM Datasheet(HTML) 84 Page - ATMEL Corporation

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84
AT89C51RD2/ED2
4235E–8051–04/04
pins, the instruction immediately following the instruction that activated the Power-Down
mode should not write to a Port pin or to the external RAM.
Note:
Exit from power-down by reset redefines all the SFRs, but does not affect the internal
RAM content.
Table 59. Pin Conditions in Special Operating Modes
Mode
Port 0
Port 1
Port 2
Port 3
Port 4
ALE
PSEN#
Reset
Floating
High
High
High
High
High
High
Idle
(internal
code)
Data
Data
Data
Data
Data
High
High
Idle
(external
code)
Floating
Data
Data
Data
Data
High
High
Power-
Down
(internal
code)
Data
Data
Data
Data
Data
Low
Low
Power-
Down
(external
code)
Floating
Data
Data
Data
Data
Low
Low



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