參數(shù)資料
型號: MC9S12E256CPV
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: MC9S12E-Family Device User Guide V01.04
中文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP112
封裝: LQFP-112
文件頁數(shù): 129/156頁
文件大小: 3077K
代理商: MC9S12E256CPV
129
B.5 Flash NVM
B.5.1 NVM timing
The time base for all NVM program or erase operations is derived from the oscillator. A minimum
oscillator frequency f
NVMOSC
is required for performing program or erase operations. The NVM modules
do not have any means to monitor the frequency and will not prevent program or erase operation at
frequencies above or below the specified minimum. Attempting to program or erase the NVM modules at
a lower frequency a full program or erase transition is not assured.
The Flash program and erase operations are timed using a clock derived from the oscillator using the
FCLKDIV register. The frequency of this clock must be set within the limits specified as f
NVMOP
.
The minimum program and erase times shown in
Table B-5
are calculated for maximum f
NVMOP
and
maximum f
bus
. The maximum times are calculated for minimum f
NVMOP
and a f
bus
of 2MHz.
B.5.1.1 Single Word Programming
The programming time for single word programming is dependent on the bus frequency as a well as on
the frequency f¨
NVMOP
and can be calculated according to the following formula.
t
swpgm
9
f
NVMOP
B.5.1.2 Row Programming
Flash programming where up to 32 words in a row can be programmed consecutively by keeping the
command pipeline filled. The time to program a consecutive word can be calculated as:
The time to program a whole row is:
Row programming is more than 2 times faster than single word programming.
B.5.1.3 Sector Erase
Erasing a 512 byte Flash sector takes:
The setup times can be ignored for this operation.
--------1
25
1
f
bus
----------
+
=
t
bwpgm
4
1
f
NVMOP
---------------------
9
1
f
bus
----------
+
=
t
brpgm
t
swpgm
31 t
bwpgm
+
=
t
era
4000
1
f
NVMOP
---------------------
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
相關(guān)PDF資料
PDF描述
MC9S12E256MFU MC9S12E-Family Device User Guide V01.04
MC9S12E256MPV MC9S12E-Family Device User Guide V01.04
MC9S12E32 MC9S12E-Family Device User Guide V01.04
MC9S12E32CFU MC9S12E-Family Device User Guide V01.04
MC9S12E32MFU MC9S12E-Family Device User Guide V01.04
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MC9S12E256CPVE 制造商:Freescale Semiconductor 功能描述:HCS12 16-BIT MICROCONTROLLER IC
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