- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄382369 > P90CL301BFH (NXP SEMICONDUCTORS) Low voltage 16-bit microcontroller PDF資料下載
參數(shù)資料
| 型號： | P90CL301BFH |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Low voltage 16-bit microcontroller |
| 中文描述： | 16-BIT, 27.02 MHz, MICROCONTROLLER, PQFP80 |
| 文件頁數(shù)： | 37/92頁 |
| 文件大小： | 526K |
| 代理商： | P90CL301BFH |
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頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁當(dāng)前第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
1996 Dec 11
37
Philips Semiconductors
Preliminary specification
Low voltage 16-bit microcontroller
P90CL301BFH (C100)
11.7
Watchdog Timer
The P90CL301BFH contains a Watchdog Timer consisting
of a 13-bit prescaler and an 8-bit timer WDTIM.
The prescaler is incremented by the peripheral clock.
The 8-bit timer is incremented every 8192 cycles of the
peripheral clock FCLK.
If the FCLK frequency is 2 MHz, the Watchdog Timer can
operate in the range of 4.1 ms up to 1 s. The Watchdog
Timer is disabled after reset. It can be enabled by writing
any value to the WDCON register. The only way to disable
a running Watchdog Timer is to reset the P90CL301BFH.
When a timer overflow occurs the microcontroller will be
reset (except registers SYSCON, PCON, PRL and PRH
which will not be reset). To prevent an overflow of the
Watchdog Timer, the User Program must reload the
Watchdog register within a period shorter than the
programmed timer interval.
This timer interval is determined by the 8-bit timer value
written to the register WDTIM.
For FCLK in MHz, the Watchdog period is:
The Watchdog Timer is controlled by the register WDCON.
A value of A5H in WDCON clears both the prescaler and
timer WDTIM. After reset, WDCON contains A5H.
Every value other than A5H in WDCON enables the
Watchdog Timer. Since the bit 0 of the WDCON input is
tied to a logic 0 by hardware during write operations on
WDCON, the reset value A5H can not be programmed
again and can only be restored by a reset.
Timer WDTIM can be written only if WDCON has
previously been loaded with 5AH, otherwise WDTIM and
the prescaler are not affected. A successful write operation
to WDTIM also clears the prescaler and clears WDCON.
Only the values A5H or 5AH are stored, all other values
are stored with a dummy value 00H.
256
WDTIM
–
(
)
FCLK
μ
s
×
Fig.11 Watchdog Timer block diagram.
handbook, full pagewidth
MBG325
INTERNAL BUS
PRESCALER
13-BIT
COUNTER REGISTER
8-BIT
WDCON
REGISTER
WDTIM
8-BIT RELOAD
REGISTER
FCLK
FCLK/8192
enable
overflow Internal
reset
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| P93U422-35DC | x4 SRAM |
| P93U422-35DM | x4 SRAM |
| P93U422-35DMB | x4 SRAM |
| P93U422-35LC | x4 SRAM |
| P93U422-35LM | x4 SRAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| P-90-F | 制造商:Hozan Tool Industrial Co Ltd 功能描述: |
| P90PCT101PC | 制造商:PERFORMANCE/ 功能描述:90PCT101PC |
| P-910 | 制造商:Hozan Tool Industrial Co Ltd 功能描述: |
| P9-100001 | 制造商:OTTO Engineering Inc 功能描述:P9-111122 EX H20 |
| P9-100002 | 制造商:OTTO Engineering Inc 功能描述:P9-111129 EX. |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。