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| 型号： | P89LPC938FDH |
| 厂商： | NXP Semiconductors N.V. |
| 元件分类： | 8位微控制器 |
| 英文描述： | 8-bit microcontroller with accelerated two-clock 80C51 core 8 kB 3 V byte-erasable Flash with 10-bit A-D converter |
| 封装： | P89LPC938FDH<SOT361-1 (TSSOP28)|<<http://www.nxp.com/packages/SOT361-1.html<1<Always Pb-free,;P89LPC938FHN<SOT788-1 (HVQFN28)|<<http://www.nxp.com/packages/SOT788-1.html& |
| 文件页数： | 11/68页 |
| 文件大小： | 318K |
| 代理商： | P89LPC938FDH |
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9397 750 14051
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 25 February 2005
19 of 68
Philips Semiconductors
P89LPC938
8-bit microcontroller with 10-bit A/D converter
7.2 Enhanced CPU
The P89LPC938 uses an enhanced 80C51 CPU which runs at six times the speed of
standard 80C51 devices. A machine cycle consists of two CPU clock cycles, and most
instructions execute in one or two machine cycles.
7.3 Clocks
7.3.1 Clock denitions
The P89LPC938 device has several internal clocks as dened below:
OSCCLK — Input to the DIVM clock divider. OSCCLK is selected from one of four clock
sources (see Figure 6) and can also be optionally divided to a slower frequency (see
Note: fosc is dened as the OSCCLK frequency.
CCLK — CPU clock; output of the clock divider. There are two CCLK cycles per machine
cycle, and most instructions are executed in one to two machine cycles (two or four CCLK
cycles).
RCCLK — The internal 7.373 MHz RC oscillator output.
PCLK — Clock for the various peripheral devices and is CCLK
2.
7.3.2 CPU clock (OSCCLK)
The P89LPC938 provides several user-selectable oscillator options in generating the CPU
clock. This allows optimization for a range of needs from high precision to lowest possible
cost. These options are congured when the Flash is programmed and include an on-chip
watchdog oscillator, an on-chip RC oscillator, an oscillator using an external crystal, or an
external clock source. The crystal oscillator can be optimized for low, medium, or high
frequency crystals covering a range from 20 kHz to 18 MHz.
7.3.3 Low speed oscillator option
This option supports an external crystal in the range of 20 kHz to 100 kHz. Ceramic
resonators are also supported in this conguration.
7.3.4 Medium speed oscillator option
This option supports an external crystal in the range of 100 kHz to 4 MHz. Ceramic
resonators are also supported in this conguration.
7.3.5 High speed oscillator option
This option supports an external crystal in the range of 4 MHz to 18 MHz. Ceramic
resonators are also supported in this conguration.
7.3.6 Clock output
The P89LPC938 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 RTC is not using the crystal oscillator as its clock source. This allows external
devices to synchronize to the P89LPC938. This output is enabled by the ENCLK bit in the
TRIM register.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| P89LPC938FDH,529 | 功能描述:8位微控制器 -MCU 80C51 8K FL 768B 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 |
| P89LPC938FDH529 | 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 18MHZ TSSOP-28 |
| P89LPC938FHN | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit microcontroller with accelerated two-clock 80C51 core 8 kB 3 V byte-erasable Flash with 10-bit A/D converter |
| P89LPC938FHN,151 | 功能描述:8位微控制器 -MCU 8K FL/768B RAM/512B 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 |
| P89LPC938FHN-S | 功能描述:8位微控制器 -MCU 8K FL/768B RAM/512B EE/10B 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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