參數(shù)資料
型號： P89V51RD2
廠商： NXP Semiconductors N.V.
英文描述： 8-bit 80C51 5 V low power 64 kB Flash microcontroller with 1 kB RAM
中文描述： 8位80C51的5 V低功耗64 kB閃存1 KB RAM內(nèi)存控制器
文件頁數(shù)： 53/77頁
文件大?。?/td> 350K
代理商： P89V51RD2
Philips Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
Product data
Rev. 03 — 02 December 2004
53 of 77
9397 750 14341
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
7.8.4
Pulse width modulator mode
All of the PCA modules can be used as PWM outputs (
Figure 26
). Output frequency
depends on the source for the PCA timer.
All of the modules will have the same frequency of output because they all share one
and only PCA timer. The duty cycle of each module is independently variable using
the module’s capture register CCAPnL.When the value of the PCA CL SFR is less
than the value in the module’s CCAPnL SFR the output will be low, when it is equal to
or greater than the output will be high. When CL overflows from FF to 00, CCAPnL is
reloaded with the value in CCAPnH. this allows updating the PWM without glitches.
The PWM and ECOM bits in the module’s CCAPMn register must be set to enable
the PWM mode.
7.8.5
PCA Watchdog timer
An on-board Watchdog timer is available with the PCA to improve the reliability of the
system without increasing chip count. Watchdog timers are useful for systems that
are susceptible to noise, power glitches, or electrostatic discharge. Module 4 is the
only PCA module that can be programmed as a Watchdog. However, this module can
still be used for other modes if the Watchdog is not needed.
Figure 26
shows a
diagram of how the Watchdog works. The user pre-loads a 16-bit value in the
compare registers. Just like the other compare modes, this 16-bit value is compared
to the PCA timer value. If a match is allowed to occur, an internal reset will be
generated. This will not cause the RST pin to be driven high.
user’s software then must periodically change (CCAP4H,CCAP4L) to keep a match
from occurring with the PCA timer (CH,CL). This code is given in the WATCHDOG
routine shown above.
In order to hold off the reset, the user has three options:
Fig 26. PCA PWM mode.
002aaa541
-
ECOMn
0
1
0
0
0
1
1
CAPPn
CAPNn
MATn
TOGn
PWMn
ECCFn
CCAPMn, n = 0 to 4
(DAH to DEH)
CCAPnL
8-BIT COMPARATOR
PCA timer/counter
CCAPnH
CL
enable
CEXn
CL
<
CCAPnL
CL
≥
CCAPnL
0
1
相關(guān)PDF資料
PDF描述
P8AX Gas Tube Coaxial Surge Protector
P8AX09BNC Gas Tube Coaxial Surge Protector
P8AX09N Gas Tube Coaxial Surge Protector
P8AX09SMA Gas Tube Coaxial Surge Protector
P8AX09TNC Gas Tube Coaxial Surge Protector
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
P89V51RD2BN 制造商:NXP Semiconductors 功能描述:IC MCU 8BIT 80C51 64K FLASH DIP40 制造商:NXP Semiconductors 功能描述:IC, MCU 8BIT 80C51 64K FLASH, DIP40
P89V51RD2BN,112 功能描述:8位微控制器 -MCU 80C51 5V 16/32/64KB FLASH MCU 1 KB RAM 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
P89V51RD2FA 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 64K FLASH PLCC44
P89V51RD2FA,512 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
P89V51RD2FA512 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 40MHZ LCC-44
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(tái)，查看報(bào)價(jià)

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(tái)，查看報(bào)價(jià)

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*