mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 682

• Manufacturer Part Number: mc9s12xs128
• Description: Hcs12 Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Electrical Characteristics
A.3.1.14
Erase Verify D-Flash for a given number of words N
A.3.1.15
D-Flash programming time is dependent on the number of words being programmed and their location
with respect to a row boundary, because programming across a row boundary requires extra steps. The D-
Flash programming time is specified for different cases (1,2,3,4 words and 4 words across a row boundary)
at a 40MHz bus frequency. The typical programming time can be calculated using the following equation,
whereby N
crossed.
The maximum programming time can be calculated using the following equation
A.3.1.16
Typical D-Flash sector erase times are those expected on a new device, where no margin verify fails occur.
They can be calculated using the following equation.
Maximum D-Fash sector erase times can be calculated using the following equation.
The D-Flash sector erase time on a new device is ~5ms and can extend to 20ms as the flash is cycled.
682
t
t check
t eradf
t eradf
=
350
≈
≈
⋅
≈
w
--------------------------- -
f NVMBUS
5025
20100
(
t
840
denotes the number of words; BC=0 if no boundary is crossed and BC=1 if a boundary is
t
dpgm
Erase Verify D-Flash Section (FCMD=0x10)
D-Flash Programming (FCMD=0x11)
Erase D-Flash Sector (FCMD=0x12)
dpgm
1
⋅
+
⋅
=
------------------------ -
f NVMOP
=
N W
------------------------ -
f NVMOP
⎛
⎝
⎛
⎝
(
(
15
15
1
)
1
+
⋅
+
(
--------------------------- -
f
(
NVMBUS
54 N
56 N
+
⋅
⋅
+
700
1
w
3300
w
)
S12XS Family Reference Manual, Rev. 1.10
)
+
+
⋅
(
(
--------------------------- -
f NVMBUS
16 BC
16 BC
⋅
--------------------------- -
f NVMBUS
⋅
⋅
1
)
)
)
1
)
⋅
⋅
------------------ -
f
------------------ -
f
NVMOP
NVMOP
1
1
W
⎞
⎠
⎞
⎠
is given by .
+
+
⎛
⎝
⎛
⎝
(
(
460
460
+
+
(
(
640 N
840 N
⋅
⋅
W
W
)
)
+
+
(
(
500 BC
500 BC
⋅
⋅
)
Freescale Semiconductor
)
)
)
⋅
⋅
-------------------- -
f
-------------------- -
f
NVMBUS
NVMBUS
1
1
⎞
⎠
⎞
⎠