AT89C51RB2-RLTCM ATMEL [ATMEL Corporation], AT89C51RB2-RLTCM Datasheet - Page 111

• Manufacturer Part Number: AT89C51RB2-RLTCM
• Description: 8-bit Microcontroller with 16K/ 32K Bytes Flash
• Manufacturer: ATMEL [ATMEL Corporation]

External Program Memory
Read Cycle
External Data Memory
Characteristics
4180B–8051–04/03
PORT 0
PORT 2
PSEN
ALE
INSTR IN
OR SFR-P2
ADDRESS
Table 78. 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
QVWH
WHQX
WLWH
QVWX
WHLH
RLRH
RHDX
RHDZ
AVDV
AVWL
RLDV
LLDV
LLWL
RLAZ
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
AT89C51RB2/RC2
ADDRESS A8-A15
INSTR IN
111