at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 121

• Manufacturer Part Number: at89c51re2-slsem
• Description: At89c51re2 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

104
AT89C51RE2
Note:
Table 82. Pin Conditions in Special Operating Modes
Down(inter
nal code)
(external
(external
(internal
Power-
Power-
Mode
Reset
code)
code)
Down
code)
Idle
Idle
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.
Exit from power-down by reset redefines all the
RAM content.
Floating
Floating
Floating
Port 0
Data
Data
Port 1
High
Data
Data
Data
Data
Port 2
High
Data
Data
Data
Data
Port 3
High
Data
Data
Data
Data
SFRs
, but does not affect the internal
Port 4
High
Data
Data
Data
Data
ALE
High
High
High
Low
Low
7663B–8051–03/07
PSEN#
High
High
High
Low
Low