FlashFlex51 MCU
SST89E52RD2 / SST89E54RD2 / SST89E58RD2 / SST89E516RD2
SST89V52RD2 / SST89V54RD2 / SST89V58RD2 / SST89V516RD2
Preliminary Specifications
T
LHLL
ALE
T
WHLH
PSEN#
T
T
WLWH
LLWL
WR#
T
T
LLAX
T
T
AVLL
QVWX
WHQX
T
QVWH
A0-A7 FROM RI or DPL
PORT 0
PORT 2
DATA OUT
A0-A7 FROM PCL
INSTR IN
T
AVWL
P2[7:0] or A8-A15 FROM DPH
A8-A15 FROM PCH
1255 F37.0
FIGURE 14-5: EXTERNAL DATA MEMORY WRITE CYCLE
TABLE 14-9: EXTERNAL CLOCK DRIVE
12MHz
Oscillator
40MHz
Variable
Symbol
1/TCLCL
TCLCL
Parameter
Min
Max
Min
Max
Min
Max
Units
MHz
ns
Oscillator Frequency
0
40
83
25
TCHCX
TCLCX
TCLCH
TCHCL
High Time
Low Time
Rise Time
Fall Time
8.75
8.75
0.35TCLCL
0.35TCLCL
0.65TCLCL
0.65TCLCL
ns
ns
20
20
10
10
ns
ns
T14-9.0 1255
V
DD - 0.5
0.7V
DD
T
CHCX
0.2 V
- 0.1
0.45 V
DD
T
T
CLCH
CLCX
T
CLCL
T
CHCL
1255 F38.0
FIGURE 14-6: EXTERNAL CLOCK DRIVE WAVEFORM
©2004 Silicon Storage Technology, Inc.
S71255-00-000
3/04
78
SST [ SILICON STORAGE TECHNOLOGY, INC ]
