Rainbow Electronics AT89C5131 - Manual (Page 159)

159
AT89C5131
4136A–USB–03/03
External Program Memory Read Cycle
External Data Memory
Characteristics Table 107. Symbol Description
T
PLIV
TPLAZ
ALE
PSEN
PORT 0
PORT 2
A0-A7 A0-A7 INSTR IN INSTR IN INSTR IN
ADDRESS
OR SFR-P2 ADDRESS A8-A15 ADDRESS A8-A15
12 T
CLCL
T
AVIV
T
LHLL
T
AVLL
T
LLIV
T
LLPL
T
PLPH
T
PXAV
T
PXIX
T
PXIZ
T
LLAX
Symbol Parameter
T
RLRH
RD Pulse Width
T
WLWH
WR Pulse Width
T
RLDV
RD to Valid Data In
T
RHDX
Data Hold After RD
T
RHDZ
Data Float After RD
T
LLDV
ALE to Valid Data In
T
AVDV
Address to Valid Data In
T
LLWL
ALE to WR or RD
T
AVWL
Address to WR or RD
T
QVWX
Data Valid to WR Transition
T
QVWH
Data set-up to WR High
T
WHQX
Data Hold After WR
T
RLAZ
RD Low to Address Float
T
WHLH
RD or WR High to ALE high