Rainbow Electronics T89C51RD2 - Manual (Page 77)

77 Rev. F - 15 February, 2001
T89C51RD2
9.5.3. External Program Memory Read Cycle
Table 40. AC Parameters for a Variable Clock
Symbol Type Standard
Clock
X2 Clock X parameter
for -M range X parameter
for -L range
Units
T
LHLL
Min 2 T - x T - x 10 10 ns
T
AVLL
Min T - x 0.5 T - x 15 15 ns
T
LLAX
Min T - x 0.5 T - x 15 15 ns
T
LLIV
Max 4 T - x 2 T - x 30 30 ns
T
LLPL
Min T - x 0.5 T - x 10 10 ns
T
PLPH
Min 3 T - x 1.5 T - x 20 20 ns
T
PLIV
Max 3 T - x 1.5 T - x 40 40 ns
T
PXIX
Min x x 0 0 ns
T
PXIZ
Max T - x 0.5 T - x 7 7 ns
T
AVIV
Max 5 T - x 2.5 T - x 40 40 ns
T
PLAZ
Max x x 10 10 ns
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