Datasheet

Appendix A Electrical Characteristics
MC9S12XE-Family Reference Manual Rev. 1.25
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
----------------------
⋅
⎝⎠
⎛⎞
+
⎝
⎠
⎛
⎞
=