參數(shù)資料
型號(hào)： P89LPC921
廠商： NXP Semiconductors N.V.
英文描述： MINIATURE POWER RELAY
中文描述： 8位微控制器兩個(gè)小時(shí)80C51的核心2鍵盤(pán)/ 4 KB的/ 8 KB的3伏的低功耗Flash 256 - RAM的字節(jié)數(shù)據(jù)
文件頁(yè)數(shù)： 15/45頁(yè)
文件大?。?/td> 877K
代理商： P89LPC921
Philips Semiconductors
P89LPC920/921/922
8-bit microcontrollers with two-clock 80C51 core
Product data
Rev. 06 — 21 November 2003
15 of 45
9397 750 12285
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
8.2.6
Clock output
The P89LPC920/921/922 supports a user-selectable clock output function on the
XTAL2/CLKOUT pin when crystal oscillator is not being used. This condition occurs if
another clock source has been selected (on-chip RC oscillator, watchdog oscillator,
external clock input on X1) and if the Real-Time clock is not using the crystal
oscillator as its clock source. This allows external devices to synchronize to the
P89LPC920/921/922. This output is enabled by the ENCLK bit in the TRIM register.
The frequency of this clock output is
1
2
that of the CCLK. If the clock output is not
needed in Idle mode, it may be turned off prior to entering Idle, saving additional
power.
8.3 On-chip RC oscillator option
The P89LPC920/921/922 has a 6-bit TRIM register that can be used to tune the
frequency of the RC oscillator. During reset, the TRIM value is initialized to a factory
pre-programmed value to adjust the oscillator frequency to 7.373 MHz,
±
1% at room
temperature. End-user applications can write to the Trim register to adjust the on-chip
RC oscillator to other frequencies.
8.4 Watchdog oscillator option
The watchdog has a separate oscillator which has a frequency of 400 kHz. This
oscillator can be used to save power when a high clock frequency is not needed.
8.5 External clock input option
In this configuration, the processor clock is derived from an external source driving
the XTAL1/P3.1 pin. The rate may be from 0 Hz up to 12 MHz. The XTAL2/P3.0 pin
may be used as a standard port pin or a clock output.
Fig 5.
Block diagram of oscillator control.
÷
2
002aaa424
RTC
CPU
WDT
BAUD RATE
GENERATOR
DIVM
CCLK
UART
OSCCLK
I
2
C
PCLK
TIMER 0 and
TIMER 1
High freq.
Med. freq.
Low freq.
XTAL1
XTAL2
RC
OSCILLATOR
WATCHDOG
OSCILLATOR
(7.3728 MHz)
(400 kHz)
相關(guān)PDF資料
PDF描述
P89LPC922 MINIATURE POWER RELAY
P89LPC920 8-bit microcontrollers with two-clock 80C51 core 2 kB/4 kB/8 kB 3 V low-power Flash with 256-byte data RAM
P89LPC931 8-bit microcontrollers with two-clock 80C51 core 4 kB/8 kB 3 V Flash with 256-byte data RAM
P8C15416Y-12 IC-8-BIT CMOS CPU
P903
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P89LPC9211FDH 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontroller with accelerated two-clock 80C51 core 2 kB/4 kB/8 kB 3 V byte-erasable flash with 8-bit ADC
P89LPC9211FDH,112 功能描述:8位微控制器 -MCU MCU 8-Bit CISC 4KB Flash2.5V/3.3V 20Pin 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
P89LPC921FDH 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers with two-clock 80C51 core 2 kB/4 kB/8 kB 3 V low-power Flash with 256-byte data RAM
P89LPC921FDH,512 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 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
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