Philips Semiconductors

User’s Manual - Preliminary -

 

 

 

 

 

 

INTERRUPTS

P89LPC901/902/903

 

 

External Interrupt Inputs

 

 

The P89LPC901/902/903 have a Keypad Interrupt function (see Keypad Interrupt (KBI) on page 79). This can be used as an external interrupt input. If enabled when the P89LPC901/902/903 is put into Power down or Idle mode, the keypad interrupt will cause the processor to wake up and resume operation. Refer to the section on Power Reduction Modes for details.

External Interrupt Pin Glitch Suppression

Most of the P89LPC901/902/903 pins have glitch suppression circuits to reject short glitches (please refer to the P89LPC901/ 902/903 datasheet, AC Electrical Characteristics for glitch filter specifications) .

 

BOPD

 

 

EBO

 

RTCF

KBIF

Wakeup (if in

ERTC

EKBI

Power down)

(RTCCON.1)

 

 

WDOVF

EWDRT

 

 

 

 

CMF

 

 

EC

 

 

EA (IE0.7)

 

 

TF1

 

 

ET1

 

 

 

Interrupt to CPU

 

TF0

 

 

ET0

 

Figure 3-1: Interrupt sources, enables, and Power down Wake-up sources - P89LPC901

2003 Dec 8

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Philips P89LPC903, P89LPC902 P89LPC901/902/903 External Interrupt Inputs, External Interrupt Pin Glitch Suppression

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.