Appendix A Electrical Characteristics
MC9S12XE-Family Reference Manual , Rev. 1.19
1228
Freescale Semiconductor
A.3.1.19
Enable EEE (FCMD=0x13)
The maximum time to enable EPROM emulation is given by
where N
SEC
is the number of sectors of constant data. A constant sector is one in which all 63 records
contain the latest active data and would need to be copied. The maximum possible is 33 (2048 EEE RAM
words /63 =32.5) although this is a highly unlikely scenario. The impact of a worst case brownout recovery
scenario is denoted by BWN = 2 for non brownout situations BWN =0.
t
1100 BWN
176
1
BWN
+
(
)
BWN
N
+
SEC
(
)
32364
⋅
+
⋅
(
)
+
⋅
(
)
(
)
1
f
NVMOP
-------------------
⋅
⎝
⎠
⎛
⎞
3050
1
BWN
+
(
)
⋅
N
SEC
BWN
+
(
)
290500
⋅
+
(
)
1
f
NVMBUS
----------------------
⋅
⎝
⎠
⎛
⎞
+
⎝
⎠
⎛
⎞
=
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages