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| 型号： | P89LPC925FDH |
| 厂商： | NXP Semiconductors N.V. |
| 元件分类： | 8位微控制器 |
| 英文描述： | 8-bit microcontrollers with accelerated two-clock 80C51 core 4 kB-8 kB 3 V low-power Flash with 8-bit A-D converter |
| 封装： | P89LPC924FDH<SOT360-1 (TSSOP20)|<<http://www.nxp.com/packages/SOT360-1.html<1<Always Pb-free,;P89LPC925FDH<SOT360-1 (TSSOP20)|<<http://www.nxp.com/packages/SOT360-1.html& |
| 文件页数： | 19/49页 |
| 文件大小： | 233K |
| 代理商： | P89LPC925FDH |
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Philips Semiconductors
P89LPC924/925
8-bit microcontrollers with accelerated two-clock 80C51 core
Product data
Rev. 03 — 15 December 2004
26 of 49
9397 750 14471
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
8.15 Power reduction modes
The P89LPC924/925 supports three different power reduction modes. These modes
are Idle mode, Power-down mode, and total Power-down mode.
8.15.1
Idle mode
Idle mode leaves peripherals running in order to allow them to activate the processor
when an interrupt is generated. Any enabled interrupt source or reset may terminate
Idle mode.
8.15.2
Power-down mode
The Power-down mode stops the oscillator in order to minimize power consumption.
The P89LPC924/925 exits Power-down mode via any reset, or certain interrupts. In
Power-down mode, the power supply voltage may be reduced to the RAM keep-alive
voltage VRAM. This retains the RAM contents at the point where Power-down mode
was entered. SFR contents are not guaranteed after VDD has been lowered to VRAM,
therefore it is highly recommended to wake up the processor via reset in this case.
VDD must be raised to within the operating range before the Power-down mode is
exited.
Some chip functions continue to operate and draw power during Power-down mode,
increasing the total power used during Power-down. These include: Brownout detect,
Watchdog Timer, Comparators (note that Comparators can be powered-down
separately), and Real-Time Clock (RTC)/System Timer. The internal RC oscillator is
disabled unless both the RC oscillator has been selected as the system clock AND
the RTC is enabled.
8.15.3
Total Power-down mode
This is the same as Power-down mode except that the brownout detection circuitry
and the voltage comparators are also disabled to conserve additional power. The
internal RC oscillator is disabled unless both the RC oscillator has been selected as
the system clock and the RTC is enabled. If the internal RC oscillator is used to clock
the RTC during Power-down, there will be high power consumption. Please use an
external low frequency clock to achieve low power with the Real-Time Clock running
during Power-down.
8.16 Reset
The P1.5/RST pin can function as either an active-LOW reset input or as a digital
input, P1.5. The RPE (Reset Pin Enable) bit in UCFG1, when set to ‘1’, enables the
external reset input function on P1.5. When cleared, P1.5 may be used as an input
pin.
Remark: During a power-up sequence, the RPE selection is overridden and this pin
will always function as a reset input. An external circuit connected to this pin
should not hold this pin LOW during a power-on sequence as this will keep the
device in reset. After power-up this input will function either as an external reset
input or as a digital input as dened by the RPE bit. Only a power-up reset will
temporarily override the selection dened by RPE bit. Other sources of reset will not
override the RPE bit.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| P89LPC925FN-S | 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 |
| P89LPC92X1 | 制造商:PHILIPS 制造商全称: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 |
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