參數(shù)資料
型號： HCS12COREUG
廠商： 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述： Device User Guide V01.18
中文描述： 設(shè)備的用戶手冊V01.18
文件頁數(shù)： 103/130頁
文件大?。?/td> 512K
代理商： HCS12COREUG
A.3 NVM, Flash and EEPROM
NOTE:
Unless otherwise noted the abbreviation NVM (Non Volatile Memory) is used for
both Flash and EEPROM.
A.3.1 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 and EEPROM program and erase operations are timed using a clock derived from the oscillator
using the FCLKDIV and ECLKDIV registers respectively. The frequency of this clock must be set within
the limits specified as f
NVMOP
.
The minimum program and erase times shown in
Table A-11
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.
A.3.1.1 Single Word Programming
The programming time for single word programming is dependant on the bus frequency as a well as on
the frequency f
NVMOP
and can be calculated according to the following formula.
t
swpgm
f
NVMOP
A.3.1.2 Burst Programming
ThisappliesonlytotheFlashwhereupto32wordsinarowcanbeprogrammedconsecutivelyusingburst
programming 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:
Burst programming is more than 2 times faster than single word programming.
9
--------1
25
1
f
bus
----------
+
=
t
bwpgm
4
1
f
NVMOP
---------------------
9
1
f
bus
----------
+
=
t
brpgm
t
swpgm
31 t
bwpgm
+
=
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
HCS12H 16-bit Microcontroller
HCS2-110-F RF Coaxial Switches (DC to 15 GHz)
HCS2-111-F RF Coaxial Switches (DC to 15 GHz)
HCS2-120-F RF Coaxial Switches (DC to 15 GHz)
HCS2-121-F RF Coaxial Switches (DC to 15 GHz)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HCS12DBFAMILYPP 制造商:未知廠家 制造商全稱:未知廠家 功能描述:HCS12DB Family Product Proposal
HCS12DFAMILYPP 制造商:未知廠家 制造商全稱:未知廠家 功能描述:HCS12 D-Family Product Proposal
HCS12H 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Microcontroller
HCS12HFAMILYPP 制造商:未知廠家 制造商全稱:未知廠家 功能描述:HCS12 H-Family Product Proposal
HCS12XDFAMILYPP 制造商:未知廠家 制造商全稱:未知廠家 功能描述:HCS12 XD-Family Product Brief
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*