AT89C51ID2-SLSIM Atmel, AT89C51ID2-SLSIM Datasheet - Page 74

• Manufacturer Part Number: AT89C51ID2-SLSIM
• Description: C51ID2 64KF TWI 32KHZ PLCC44 3-5.5V IND.
• Manufacturer: Atmel

4289C–8051–11/05
Note:
Table 57. 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
AT89C51ID2
ALE
High
High
High
Low
Low
PSEN#
High
High
High
Low
Low
74