vrs51c1000 Ramtron Corporation, vrs51c1000 Datasheet - Page 43

• Manufacturer Part Number: vrs51c1000
• Description: Versa 8051 Mcu With 64kb Of Iap/isp Flash
• Manufacturer: Ramtron Corporation

Timing Requirement of the External Clock (VSS = 0v is assumed)
External Program Memory Read Cycle
The following timing diagram provides External Program Memory Read Cycle timing information.
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F
F
IGURE
IGURE
0.45V
VRS51C1000
Vdd - 0.5V
28: T
29: E
IMING
XTERNAL
R
PORT 0
PORT2
EQUIREMENT OF
#PSEN
P
ROGRAM
ALE
20% Vdd-0.1V
M
EMORY
70% Vdd
E
XTERNAL
R
EAD
C
C
LOCK
YCLE
(VSS= 0.0V
TLHLL
TAVLL
A0-A7
IS ASSUMED
TLLAX
P2.0-P2.7 or AB-A15 from DPH
TCHCL
)
TLLPL
TPLAZ
TAVIV
TCLCX
TPLIV
TPLPH
Instruction IN
TCLCH
TCLCL
TPXIX
TPXIZ
TCHCX
A0-A7
page 43 of 48
A8-A15