mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 579

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

A.4.1.4
Erasing a NVM block takes:
The setup times can be ignored for this operation.
A.4.1.5
The time it takes to perform a blank check on the Flash is dependant on the location of the first non-blank
word starting at relative address zero. It takes one bus cycle per word to verify plus a setup of the command.
1
2
3
4
5
6
7
Freescale Semiconductor
Conditions are shown in
Num
Restrictions for oscillator in crystal mode apply!
Minimum Programming times are achieved under maximum NVM operating frequency f
f
Maximum Erase and Programming times are achieved under particular combinations of f
to formulae in
Minimum Erase times are achieved under maximum NVM operating frequency f
Minimum time, if first word in the array is not blank
Maximum time to complete check on an erased block
Where t
bus
1
2
3
4
5
6
7
8
9
.
cyc
C
D
D
D
D
D
D
P
P
P
is the system bus clock period.
External Oscillator Clock
Bus frequency for Programming or Erase Operations
Operating Frequency
Single Word Programming Time
Flash Burst Programming consecutive word
Flash Burst Programming Time for 64 Word row
Sector Erase Time
Mass Erase Time
Blank Check Time Flash per block
Mass Erase
Blank Check
Section A.4.1.1, “Single Word Programming”
Table A-4
unless otherwise noted
Rating
Table A-14. NVM Timing Characteristics
MC9S12E256 Data Sheet, Rev. 1.08
t
check
t
mass
location t
20000
through
cyc
------------------------ -
f
NVMOP
Section A.4.1.4, “Mass Erase”
+
f
f
Symbol
1
NVMOSC
NVMBUS
f
t
t
NVMOP
t
t
10 t
swpgm
bwpgm
t
brpgm
mass
check
t
era
cyc
NVMOP
1331.2
20.4
100
Min
150
46
20
11
0.5
.
1
NVMOP
NVMOP
2
4
5
Appendix A Electrical Characteristics
4
2
2
and bus frequency f bus. Refer
and maximum bus frequency
Typ
—
—
—
—
—
—
—
—
—
for guidance.
2027.5
65546
74.5
26.7
133
Max
50
200
31
—
1
3
3
3
3
6
3
7
MHz
MHz
Unit
kHz
ms
ms
t
cyc
s
s
s
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