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| 型号： | P89LPC9251FDH |
| 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 2 kB-4 kB-8 kB 3 V byte-erasable flash with 8-bit ADC |
| 中文描述： | MICROCONTROLLER, PDSO20 |
| 封装： | 4.40 MM, PLASTIC, MO-153, SOT360-1, TSSOP-20 |
| 文件页数： | 20/75页 |
| 文件大小： | 1612K |
| 代理商： | P89LPC9251FDH |
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P89LPC92X1
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 2 — 1 December 2010
27 of 75
NXP Semiconductors
P89LPC9201/9211/922A1/9241/
8-bit microcontroller with 8-bit ADC
7.5 Clock output
The P89LPC9201/9211/922A1/9241/9251 supports a user-selectable clock output
function on the P3.0/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 XTAL1) and if the RTC and WDT are not using
the crystal oscillator as their clock source. This allows external devices to synchronize to
the P89LPC9201/9211/922A1/9241/9251. 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.
7.6 On-chip RC oscillator option
The P89LPC9201/9211/922A1/9241/9251 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 preprogrammed 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. When the clock doubler option is enabled
(UCFG2.7 = 1), the output frequency is 14.746 MHz. If CCLK is 8 MHz or slower, the
CLKLP SFR bit (AUXR1.7) can be set to logic 1 to reduce power consumption. On reset,
CLKLP is logic 0 allowing highest performance access. This bit can then be set in
software if CCLK is running at 8 MHz or slower. When clock doubler option is enabled,
BOE1 bit (UCFG1.5) and BOE0 bit (UCFG1.3) are required to hold the device in reset at
power-up until VDD has reached its specified level.
7.7 Watchdog oscillator option
The watchdog has a separate oscillator which has a frequency of 400 kHz, calibrated to
± 5 % at room temperature. This oscillator can be used to save power when a high clock
frequency is not needed.
7.8 External clock input option
In this configuration, the processor clock is derived from an external source driving the
P3.1/XTAL1 pin. The rate may be from 0 Hz up to 18 MHz. The P3.0/XTAL2/CLKOUT pin
may be used as a standard port pin or a clock output. When using an oscillator frequency
above 12 MHz, BOE1 bit (UCFG1.5) and BOE0 bit (UCFG1.3) are required to hold the
device in reset at power-up until VDD has reached its specified level.
7.9 Clock sources switch on the fly
P89LPC9201/9211/922A1/9241/9251 can implement clock source switch in any sources
of watchdog oscillator, 7 MHz/14 MHz internal RC oscillator, external clock source
(external crystal or external clock input) during code is running. CLKOK bit in CLKCON
register is used to indicate the clock switch status. CLKOK is cleared when starting clock
source switch and set when completed. Notice that when CLKOK is ‘0’, writing to
CLKCON register is not allowed.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| P89LPC9251FDH,112 | 功能描述:8位微控制器 -MCU MCU 8-Bit CISC 8KB Flash2.5V/3.3V 20Pin 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 |
| P89LPC925FDH | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit microcontrollers with accelerated two-clock 80C51 core 4 kB/8 kB 3 V low-power Flash with 8-bit A/D converter |
| P89LPC925FDH,529 | 功能描述:8位微控制器 -MCU 80C51 8K 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 |
| P89LPC925FDH-S | 制造商:NXP Semiconductors 功能描述:MCU 8-bit P89 80C51 CISC 8KB Flash 2.5V/3.3V 20-Pin TSSOP |
| P89LPC925FN,129 | 功能描述:8位微控制器 -MCU 8K FL/256B RAM/I2C/UART/ADC 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 |
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