Freescale Semiconductor Demonstration Board for Freescale MC9S12XHY256 Microcontroller DEMO9S12XHY256 DEMO9S12XHY256 Manuale Utente
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DEMO9S12XHY256
Electrical Characteristics
MC9S12XHY-Family Reference Manual, Rev. 1.04
Freescale Semiconductor
737
The minimum program and erase times shown in
are calculated for maximum f
NVMOP
and
maximum f
NVMBUS
unless otherwise shown. The maximum times are calculated for minimum f
NVMOP
A.3.1.1
Erase Verify All Blocks (Blank Check) (FCMD=0x01)
The time it takes to perform a blank check is dependant on the location of the first non-blank word starting
at relative address zero. It takes one bus cycle per phrase to verify plus a setup of the command. Assuming
that no non blank location is found, then the erase verify all blocks is given by.
at relative address zero. It takes one bus cycle per phrase to verify plus a setup of the command. Assuming
that no non blank location is found, then the erase verify all blocks is given by.
A.3.1.2
Erase Verify Block (Blank Check) (FCMD=0x02)
The time it takes to perform a blank check is dependant on the location of the first non-blank word starting
at relative address zero. It takes one bus cycle per phrase to verify plus a setup of the command. Assuming
that no non blank location is found, then the erase verify time for a single 256K NVM array is given by
at relative address zero. It takes one bus cycle per phrase to verify plus a setup of the command. Assuming
that no non blank location is found, then the erase verify time for a single 256K NVM array is given by
For a 128K NVM or D-Flash array the erase verify time is given by
A.3.1.3
Erase Verify P-Flash Section (FCMD=0x03)
The maximum time depends on the number of phrases being verified (N
VP
)
A.3.1.4
Read Once (FCMD=0x04)
The maximum read once time is given by
A.3.1.5
Program P-Flash (FCMD=0x06)
The programming time for a single phrase of four P-Flash words + associated eight ECC bits is dependant
on the bus frequency as a well as on the frequency f
on the bus frequency as a well as on the frequency f
NVMOP
and can be calculated according to the
following formulas.
t
check
33500
1
f
NVMBUS
---------------------
⋅
=
t
check
33500
1
f
NVMBUS
---------------------
⋅
=
t
check
17200
1
f
NVMBUS
---------------------
⋅
=
t
check
752
N
VP
+
(
)
1
f
NVMBUS
---------------------
⋅
=
t
400
(
)
1
f
NVMBUS
---------------------
⋅
=