Philips SemiconductorsUser’s Manual - Preliminary -

 

GENERAL DESCRIPTION

P89LPC901/902/903

 

 

 

 

 

 

 

 

 

 

 

MNEMONIC

PIN NO.

TYPE

NAME AND FUNCTION

 

 

 

 

 

O

XTAL2 Output from the oscillator amplifier (when a crystal oscillator

 

 

 

 

 

 

option is selected via the FLASH configuration).

 

 

 

 

 

O

CLKOUTCPU clock divided by 2 when enabled via SFR bit (ENCLK -

 

 

 

 

 

 

TRIM.6). It can be used if the CPU clock is the internal RC

 

 

 

 

 

 

oscillator, watchdog oscillator or external clock input, except

 

 

 

 

 

 

when XTAL1/XTAL2 are used to generate clock source for

 

 

 

 

 

 

the Real-Time clock/system timer.

 

 

 

 

2

I/O

P3.1

Port 3 bit 1.

 

 

 

 

 

I

XTAL1

Input to the oscillator circuit and internal clock generator

 

 

 

 

 

 

circuits (when selected via the FLASH configuration). It can

 

 

 

 

 

 

be a port pin if internal RC oscillator or watchdog oscillator

 

 

 

 

 

 

is used as the CPU clock source, AND if XTAL1/XTAL2 are

 

 

 

 

 

 

not used to generate the clock for the Real-Time clock/

 

 

 

 

 

 

system timer.

 

 

 

VSS

8

I

Ground: 0V reference.

 

 

 

VDD

1

I

Power Supply: This is the power supply voltage for normal operation as

 

 

 

 

 

well as Idle and Power down modes.

 

 

2003 Dec 8

13

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Philips P89LPC903, P89LPC901, P89LPC902 user manual P3.1, XTAL1

P89LPC903, P89LPC902, P89LPC901 specifications

The Philips P89LPC901, P89LPC902, and P89LPC903 are a series of 8-bit microcontrollers designed for embedded system applications. These models, which belong to the LPC900 series, are notable for their affordability and versatility, making them an attractive choice for both hobbyists and professional developers.

One of the core features of the P89LPC901, P89LPC902, and P89LPC903 microcontrollers is their powerful 8-bit architecture. Operating at clock speeds up to 20 MHz, they deliver efficient performance suited for a range of tasks. Each model includes a comprehensive instruction set that supports various data manipulation and arithmetic functions, enabling extensive programming capabilities.

These microcontrollers come with built-in memory, with configurations that vary among the three models. The P89LPC901 typically features 4 KB of Flash memory and 256 bytes of RAM, while the P89LPC902 and P89LPC903 offer enhanced memory options. This Flash memory allows for reprogrammability, making it easier to update and modify applications as needed.

Another significant characteristic of the LPC900 series is their integrated peripherals. These models are equipped with a variety of I/O ports, allowing for easy interfacing with other devices and components. The P89LPC901 supports up to 32 I/O pins, while the P89LPC902 and P89LPC903 provide additional features such as analog-to-digital converters (ADCs), timers, and serial communication interfaces. This broad range of peripherals empowers developers to design complex applications without needing extra hardware.

Power consumption is also a key consideration for microcontroller applications. The P89LPC901, P89LPC902, and P89LPC903 are designed with low power consumption in mind, making them ideal for battery-operated devices and energy-efficient projects. They can operate in various power modes, allowing for greater flexibility in deployment.

In terms of technology, these microcontrollers utilize advanced CMOS technology, ensuring high reliability and durability. Their design offers a robust solution for numerous applications, including consumer electronics, industrial controls, and automation systems.

In summary, the Philips P89LPC901, P89LPC902, and P89LPC903 microcontrollers present an attractive combination of performance, integrated peripherals, low power consumption, and versatility. Their features cater to a wide array of applications, keeping them relevant in a rapidly evolving technology landscape. For hobbyists and professionals alike, these microcontrollers represent a reliable foundation for embedded system development.