- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄366891 > CR16HCT9VJE8 Microcontroller PDF資料下載
參數(shù)資料
| 型號： | CR16HCT9VJE8 |
| 英文描述： | Microcontroller |
| 中文描述： | 微控制器 |
| 文件頁數(shù)： | 30/157頁 |
| 文件大?。?/td> | 1256K |
| 代理商： | CR16HCT9VJE8 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁當(dāng)前第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁
www.national.com
30
When BOOTAREA has any value other than 7F
16
, then the
memory at 0 to (BOOTAREA￥128)+15 is considered as user
boot ROM area and is write protected. When it has a value of
7F
16
, then there is no user boot ROM area to be write pro-
tected
9.4.8
Flash Program Memory Control Register 2
(FLCTRL2)
The FLCTRL2 register is a read-only word-wide register. The
value of this register is loaded from memory addresses
E5FC
16
and E5FE
16
when the chip comes out of reset. When
the device starts execution, the EMPTY bit indicates whether
the flash EEPROM program memory is empty of not, and se-
lects the chip to be in IRE or ISP environment if the external
environment pins are all high. The CODEAREA field defines
a user code area to be write protected. The Flash EEPROM
Program Memory Control Register 2 format is shown below:
15
13 12
EMPTY
Reserved
EMPTY
When the bits are either 011
2
, 101
2
, 110
2
, or
111
2
, and if the device’s environment select
pins are all high, the device will come out of re-
set in ISP environment instead of IRE environ-
ment.
CODEAREA When it has any value other than 3FF
16
, then
the memory (CODEAREA￥128) to 1FFFF
16
is
considered as user code area and is write pro-
tected. When it has a value of 3FF
16
, then there
is no code protection area to be write protect-
ed.
9.4.9
Flash Program Memory Security Register
(FLSEC)
The FLSEC register is a read-only byte-wide register. When
the chip comes out of reset, the value of this register is load-
ed from memory address E5FF
16
. The FROMRD and
FROMWR field control the read and write security of the flash
EEPROM program memory respectively. The Flash EE-
PROM Program Memory Security register format is shown
below:
7
4 3
FROMWR
0000, 0001, 0010, 0100, 1000: Security feature enabled
0011, 0101, 011x, 1001, 101x, 11xx: Security feature disabled
FROMRD
When read security feature is enabled, the
flash EEPROM program memory can only be
read in IRE environment, but will return 0000
16
in other environments; also, erase to odd num-
bered bytes from address E5F9
16
to E5FF
16
and mass erase to ISP and flash EEPROM
data memory array are ignored unless PADX is
activated (see security override below).
FROMWR
Unless PADX is activated (see override below),
when write security feature is enabled, all fur-
ther writes and erases to flash EEPROM pro-
gram memory, erase to odd numbered bytes
from address E5F9
16
to E5FF
16
, and mass
erase to ISP and flash EEPROM data memory
array are ignored.
9.4.10
The In-System-Programming Memory Write Key (ISPKEY)
register is a byte-wide, write-only register. It contains the en-
able key to enable writes to ISP flash EEPROM program
memory. A value of 6A
16
must be written to this register im-
mediately preceding every write to the ISP flash EEPROM
program memory for the flash write operation to proceed,
otherwise any other write operation will clear the key (the
only exception is that the subsequent write is another write to
this key register with the proper key, in which case the key is
still set). A read always returns FF
16
. Engineering note: on
reset, the write enable status that is generated as a result of
a write to this key register is cleared. The ISP Memory Write
Key register format is shown below:
ISP Memory Write Key Register (ISPKEY)
ISPKYVAL is the ISP Flash Program Memory Write Enable
Key Value.
10 9
0
CODEAREA
0
FROMRD
7
0
ISPKYVAL
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CR16HCT9VJE8Y | Microcontroller |
| CR16HCT9VJE9 | Microcontroller |
| CR16HCT9VJE9Y | Microcontroller |
| CR16MCT5VJE8Y | Microcontroller |
| CR16MCT5VJE9Y | Microcontroller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CR16HCT9VJE8Y | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| CR16HCT9VJE9 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| CR16HCT9VJE9Y | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| CR16HCT9VJEX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:CR16MCT9/CR16MCT5/CR16HCT9/CR16HCT5 16-Bit Reprogrammable/ROM Microcontroller |
| CR16HCT9VJEXY | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:CR16MCT9/CR16MCT5/CR16HCT9/CR16HCT5 16-Bit Reprogrammable/ROM Microcontroller |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。