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AT89C51ID2-RDTIM Datasheet(PDF) 75 Page - ATMEL Corporation

Part # AT89C51ID2-RDTIM
Description  8-bit Flash Microcontroller
PDF  159 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ID2-RDTIM Datasheet(HTML) 75 Page - ATMEL Corporation

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AT89C51ID2
4289A–8051–09/03
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 56. 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(inter
nal code)
Data
Data
Data
Data
Data
Low
Low
Power-
Down
(external
code)
Floating
Data
Data
Data
Data
Low
Low



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