at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 154

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

External Program Memory
Read Cycle
External Data Memory
Characteristics
7663B–8051–03/07
PORT 0
PORT 2
PSEN
ALE
INSTR IN
OR SFR-P2
ADDRESS
Table 101. Symbol Description
T
LHLL
T
T
LLAX
Symbol
AVLL
T
T
T
T
T
T
T
T
T
T
T
T
T
T
A0-A7
WLWH
QVWX
QVWH
WHQX
RHDX
RHDZ
AVWL
WHLH
RLRH
RLDV
AVDV
RLAZ
LLDV
LLWL
T
AVIV
ADDRESS A8-A15
T
LLIV
T
LLPL
TPLAZ
T
Parameter
RD Pulse Width
WR Pulse Width
RD to Valid Data In
Data Hold After RD
Data Float After RD
ALE to Valid Data In
Address to Valid Data In
ALE to WR or RD
Address to WR or RD
Data Valid to WR Transition
Data Set-up to WR High
Data Hold After WR
RD Low to Address Float
RD or WR High to ALE high
PLIV
T
PLPH
INSTR IN
T
PXIX
12 T
CLCL
T
PXIZ
T
PXAV
A0-A7
ADDRESS A8-A15
INSTR IN
137