at89c51rd2-smsum ATMEL Corporation, at89c51rd2-smsum Datasheet - Page 122

• Manufacturer Part Number: at89c51rd2-smsum
• Description: 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

25.3.6
25.3.7
122
AT89C51RD2/ED2
External Data Memory Read Cycle
Serial Port Timing - Shift Register Mode
PORT 0
PORT 2
ALE
PSEN
RD
OR SFR-P2
ADDRESS
Table 25-7.
Table 25-8.
Symbol
T
T
T
T
T
QVHX
XHQX
XHDX
XHDV
XLXL
Symbol
Symbol Description
AC Parameters for a Fix Clock
T
T
T
T
T
QVHX
XHQX
XHDX
XHDV
XLXL
A0-A7
T
LLAX
T
AVWL
T
LLWL
Parameter
Serial port clock cycle time
Output data set-up to clock rising edge
Output data hold after clock rising edge
Input data hold after clock rising edge
Clock rising edge to input data valid
T
AVDV
T
LLDV
ADDRESS A8-A15 OR SFR P2
T
RLAZ
Min
300
200
30
0
T
RLRH
-M
DATA IN
T
T
WHLH
RHDX
T
RHDZ
Max
117
4235J–8051–01/08
Units
ns
ns
ns
ns
ns