- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄367743 > P89LV51RD2BA (NXP SEMICONDUCTORS) 8-bit 80C51 3 V low power 64 kB Flash microcontroller with 1 kB RAM PDF資料下載
參數(shù)資料
| 型號(hào)： | P89LV51RD2BA |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-bit 80C51 3 V low power 64 kB Flash microcontroller with 1 kB RAM |
| 中文描述： | 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, MS-018, SOT-187-2, LCC-44 |
| 文件頁(yè)數(shù)： | 45/77頁(yè) |
| 文件大小： | 349K |
| 代理商： | P89LV51RD2BA |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)當(dāng)前第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)
Philips Semiconductors
P89LV51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
Product data
Rev. 04 — 02 December 2004
45 of 77
9397 750 14342
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
7.7 Watchdog timer
The device offers a programmable Watchdog Timer (WDT) for fail safe protection
against software deadlock and automatic recovery.
To protect the system against software deadlock, the user software must refresh the
WDT within a user-defined time period. If the software fails to do this periodical
refresh, an internal hardware reset will be initiated if enabled (WDRE = 1). The
software can be designed such that the WDT times out if the program does not work
properly.
The WDT in the device uses the system clock (XTAL1) as its time base. So strictly
speaking, it is a Watchdog counter rather than a Watchdog timer. The WDT register
will increment every 344,064 crystal clocks. The upper 8-bits of the time base register
(WDTD) are used as the reload register of the WDT.
The WDTS flag bit is set by WDT overflow and is not changed by WDT reset. User
software can clear WDTS by writing ‘1' to it.
Figure 20
provides a block diagram of the WDT. Two SFRs (WDTC and WDTD)
control Watchdog timer operation. During idle mode, WDT operation is temporarily
suspended, and resumes upon an interrupt exit from idle.
The time-out period of the WDT is calculated as follows:
Period = (255
WDTD)
×
344064
×
1/f
CLK (XTAL1)
where WDTD is the value loaded into the WDTD register and f
osc
is the oscillator
frequency.
Fig 20. Block diagram of programmable Watchdog timer
002aaa531
WDT
UPPER BYTE
WDT reset
internal reset
344064
clks
COUNTER
CLK (XTAL1)
external RST
WDTC
WDTD
Table 35:
Bit addressable; Reset value: 00H
Bit
7
Symbol
-
WDTC - Watchdog control register (address COH) bit allocation
6
-
5
-
4
3
2
1
0
WDOUT
WDRE
WDTS
WDT
SWDT
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| P89LV51RC2 | 8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
| P89LV51RC2BN | 8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
| P89LV51RC2FA | 8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
| P89V51RB2 | 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
| P89V51RB2BA | 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| P89LV51RD2BA,512 | 功能描述:8位微控制器 -MCU P89LV51RD2BA/PLCC44/TUBEDP// RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| P89LV51RD2BBC | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
| P89LV51RD2BBC,557 | 功能描述:8位微控制器 -MCU 80C51 64K FL / 1K RM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| P89LV51RD2BN | 功能描述:8位微控制器 -MCU 3V 64K/1K FL 12/6 CLK ISP/IAP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| P89LV51RD2BN,112 | 功能描述:8位微控制器 -MCU 3V 64K/1K FL 12/6 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。