DS87C530 Maxim, DS87C530 Datasheet - Page 36

• Manufacturer Part Number: DS87C530
• Description: The DS87C530/DS83C530 EPROM/ROM microcontrollers with a real-time clock (RTC) are 8051-compatible microcontrollers based on the Dallas Semiconductor high-speed core
• Manufacturer: Maxim

MOVX CHARACTERISTICS USING STRETCH MEMORY CYCLES
Data Access ALE Pulse Width
Port 0 Address Valid to ALE Low
Address Hold After ALE Low for
MOVX Write
Data Hold After Read
Data Float After Read
ALE Low to Valid Data In
Port 0 Address to Valid Data In
Port 2 Address to Valid Data In
ALE Low to RD or WR Low
Port 0 Address to RD or WR Low
Port 2 Address to RD or WR Low
Data Valid to WR Transition
Data Hold After Write
Note 1:
RD Pulse Width
RD Low Valid Data In
RD Low to Address Float
RD or WR High to ALE High
WR Pulse Width
PARAMETER
t
selection.
MCS
is a time period related to the Stretch memory cycle selection. The following table shows the value of t
DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock
SYMBOL
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
AVWL1
AVWL2
t
AVDV1
AVDV2
LHLL2
AVLL2
LLAX2
WLWH
QVWX
WHQX
WHLH
RLDV
RHDX
RHDZ
LLWL
RLRH
LLDV
RLAZ
36 of 45
0.5t
0.5t
1.5t
2.5t
1.5t
0.5t
2t
2t
2t
2t
2t
t
t
t
t
t
t
t
t
MCS
MCS
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
MIN
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
-6
-4
VARIABLE CLOCK
0
-10
-10
-5
-7
-5
-9
-5
-5
-5
-5
-5
-7
-6
-10
-10
-17
-16
-5
-5
t
t
t
MCS
MCS
MCS
2.5t
3.5t
0.5t
2t
3t
(Note 1)
2t
t
t
t
t
+2.5
MAX
MCS
+2
CLCL
CLCL
CLCL
CLCL
+t
CLCL
CLCL
CLCL
CLCL
CLCL
10
CLCL
CLCL
-24
+5
+5
LCL
-22
-5
-29
-5
-31
-37
+5
-26
-29
-37
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MCS
for each Stretch
STRETCH
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
—
=0
>0
=0
>0
=0
>0
=0
>0
=0
>0
=0
=0
>0
=0
>0
=0
>0
=0
>0
=0
>0
=0
>0
=0
>0
=0
>0
=0
>0
>0