- 您现在的位置：买卖IC网 > PDF目录296762 > P89LPC9331FDH (NXP SEMICONDUCTORS) 8-bit microcontroller with accelerated two-clock 80C51 core, 4 kB-8 kB-16 kB 3 V byte-erasable flash with 8-bit ADCs PDF资料下载
参数资料
| 型号： | P89LPC9331FDH |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-bit microcontroller with accelerated two-clock 80C51 core, 4 kB-8 kB-16 kB 3 V byte-erasable flash with 8-bit ADCs |
| 中文描述： | 8-BIT, FLASH, 18 MHz, MICROCONTROLLER, PDSO28 |
| 封装： | 4.40 MM, PLASTIC, MO-153, SOT361-1, TSSOP-28 |
| 文件页数： | 50/94页 |
| 文件大小： | 629K |
| 代理商： | P89LPC9331FDH |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页当前第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页
P89LPC9331_9341_9351_9361
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 5 — 10 January 2011
54 of 94
NXP Semiconductors
P89LPC9331/9341/9351/9361
8-bit microcontroller with accelerated two-clock 80C51 core
7.28 Watchdog timer
The watchdog timer causes a system reset when it underflows as a result of a failure to
feed the timer prior to the timer reaching its terminal count. It consists of a programmable
12-bit prescaler, and an 8-bit down counter. The down counter is decremented by a tap
taken from the prescaler. The clock source for the prescaler can be the PCLK, the nominal
400 kHz watchdog oscillator or low speed crystal oscillator. The watchdog timer can only
be reset by a power-on reset. When the watchdog feature is disabled, it can be used as
an interval timer and may generate an interrupt. Figure 22 shows the watchdog timer in
Watchdog mode. Feeding the watchdog requires a two-byte sequence. If PCLK is
selected as the watchdog clock and the CPU is powered down, the watchdog is disabled.
The watchdog timer has a time-out period that ranges from a few
μs to a few seconds.
Please refer to the P89LPC9331/9341/9351/9361 User manual for more details.
7.29 Additional features
7.29.1 Software reset
The SRST bit in AUXR1 gives software the opportunity to reset the processor completely,
as if an external reset or watchdog reset had occurred. Care should be taken when writing
to AUXR1 to avoid accidental software resets.
7.29.2 Dual data pointers
The dual Data Pointers (DPTR) provides two different Data Pointers to specify the
address used with certain instructions. The DPS bit in the AUXR1 register selects one of
the two Data Pointers. Bit 2 of AUXR1 is permanently wired as a logic 0 so that the DPS
bit may be toggled (thereby switching Data Pointers) simply by incrementing the AUXR1
register, without the possibility of inadvertently altering other bits in the register.
(1) Watchdog reset can also be caused by an invalid feed sequence, or by writing to WDCON not immediately followed by a feed
sequence.
Fig 22. Watchdog timer in Watchdog mode (WDTE = 1)
PRE2
PRE1
PRE0
-
WDRUN
WDTOF
WDCLK
WDCON (A7H)
SHADOW REGISTER
PRESCALER
002aae015
8-BIT DOWN
COUNTER
WDL (C1H)
watchdog
oscillator
crystal
oscillator
PCLK
XTALWD
÷32
0
1
0
1
MOV WFEED1, #0A5H
MOV WFEED2, #05AH
reset(1)
相关PDF资料 |
PDF描述 |
|---|---|
| P89LPC9331HDH | 8-bit microcontroller with accelerated two-clock 80C51 core, 4 kB-8 kB-16 kB 3 V byte-erasable flash with 8-bit ADCs |
| P89LPC9341FDH | 8-bit microcontroller with accelerated two-clock 80C51 core, 4 kB-8 kB-16 kB 3 V byte-erasable flash with 8-bit ADCs |
| P89LPC9351FDH | 8-bit microcontroller with accelerated two-clock 80C51 core, 4 kB-8 kB-16 kB 3 V byte-erasable flash with 8-bit ADCs |
| P89LPC9361FDH | 8-bit microcontroller with accelerated two-clock 80C51 core, 4 kB-8 kB-16 kB 3 V byte-erasable flash with 8-bit ADCs |
| P89LPC933FDH | 8-bit microcontroller with accelerated two-clock 80C51 core 4 kB-8 kB-16 kB 3 V byte-erasable flash with 8-bit ADCs |
相关代理商/技术参数 |
参数描述 |
|---|---|
| P89LPC9331FDH,512 | 功能描述:8位微控制器 -MCU IC 80C51 MCU FLASH 4K RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| P89LPC9331FDH512 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| P89LPC9331HDH | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit microcontroller with accelerated two-clock 80C51 core, 4 kB/8 kB/16 kB 3 V byte-erasable flash with 8-bit ADCs |
| P89LPC933FDH | 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 4K FLASH TSSOP28 |
| P89LPC933FDH,529 | 功能描述:8位微控制器 -MCU 80C51 4K FL 256B RAM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
发布紧急采购，3分钟左右您将得到回复。