ATWEBDVK-02VOIP Atmel, ATWEBDVK-02VOIP Datasheet - Page 82
ATWEBDVK-02VOIP
Manufacturer Part Number
ATWEBDVK-02VOIP
Description
KIT DEV TCP/IP AT89C51RD2 VOIP
Manufacturer
Atmel
Series
@Webr
Datasheet
1.ATWEBDVK-02RC.pdf
(137 pages)
Specifications of ATWEBDVK-02VOIP
Main Purpose
*
Embedded
*
Utilized Ic / Part
AT89C51RD2
Primary Attributes
*
Secondary Attributes
*
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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AT89C51RD2/ED2
Note:
Note:
Table 18-1.
Reset
Idle (internal
code)
Idle (external
code)
Power-Down
(internal
code)
Power-Down
(external
code)
3. Generate an enabled external Keyboard interrupt (same behavior as external interrupt).
Mode
continue for a number of clock cycles before the internal reset algorithm takes
control. Reset initializes the AT89C51RD2/ED2 and vectors the CPU to address
0000h.
During the time that execution resumes, the internal RAM cannot be accessed; however, it is pos-
sible for the Port pins to be accessed. To avoid unexpected outputs at the Port 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
content.
Pin Conditions in Special Operating Modes
Floating
Floating
Floating
Port 0
Data
Data
Port 1
High
Data
Data
Data
Data
Port 2
High
Data
Data
Data
Data
SFRs
Port 3
High
Data
Data
Data
Data
, but does not affect the internal RAM
Port 4
High
Data
Data
Data
Data
High
High
High
ALE
Low
Low
4235K–8051–05/08
PSEN#
High
High
High
Low
Low
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