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Document #: 38-08032 Rev. *L Page 38 of 62
10.2 Program Memory Read
Figure 12. Program Memory Read Timing Diagram
t
CL
t
DH
t
SOEL
t
SCSL
PSEN#
D[7..0]
OE#
A[15..0]
CS#
t
STBL
data in
t
ACC1
t
AV
t
STBH
t
AV
CLKOUT
[17]
[18]
Table 15. Program Memory Read Parameters
Parameter Description Min Typ Max Unit Notes
t
CL
1/CLKOUT Frequency 20.83 ns 48 MHz
41.66 ns 24 MHz
83.2 ns 12 MHz
t
AV
Delay from Clock to Valid Address 0 10.7 ns
t
STBL
Clock to PSEN Low 0 8 ns
t
STBH
Clock to PSEN High 0 8 ns
t
SOEL
Clock to OE Low 11.1 ns
t
SCSL
Clock to CS Low 13 ns
t
DSU
Data Setup to Clock 9.6 ns
t
DH
Data Hold Time 0 ns
Notes
17. CLKOUT is shown with positive polarity.
18. t
ACC1
is computed from the above parameters as follows:
t
ACC1
(24 MHz) = 3*t
CL
– t
AV
– t
DSU
= 106 ns
t
ACC1
(48 MHz) = 3*t
CL
– t
AV
– t
DSU
= 43 ns.
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