Philips Semiconductors

 

 

 

User’s Manual - Preliminary -

 

 

 

 

 

 

 

 

 

 

 

REAL-TIME CLOCK/SYSTEM TIMER

P89LPC901/902/903

 

 

Table 6-1: Real-time Clock/System Timer Clock Source - P89LPC901

 

 

 

 

FOSC2

FOSC1

FOSC0

RTCS1:0

 

 

 

 

 

(UCFG1.2)

(UCFG1.1)

(UCFG1.0)

CCLK Frequency

RTC Clock Frequency

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

00

 

High frequency crystal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

01

 

 

 

 

 

 

 

 

(XCLK)

 

 

 

0

0

0

 

High frequency crystal/DIVM

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

 

High frequency crystal/DIVM

 

 

 

 

 

 

 

(CCLK)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

00

 

Medium frequency crystal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

01

 

 

 

 

 

 

 

 

(XCLK)

 

 

 

0

0

1

 

Medium frequency crystal/DIVM

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

 

Medium frequency crystal/

 

 

 

 

 

 

 

DIVM (CCLK)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

00

 

Low frequency crystal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

01

 

 

 

 

 

 

 

 

(XCLK)

 

 

 

0

1

0

 

Low frequency crystal/DIVM

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

 

Low frequency crystal/DIVM

 

 

 

 

 

 

 

(CCLK)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

00

 

High frequency crystal

 

 

 

 

 

 

 

(XCLK)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

01

 

Medium frequency crystal

 

 

 

0

1

1

RC Oscillator/DIVM

(XCLK)

 

 

 

 

 

 

 

 

 

 

10

 

Low frequency crystal

 

 

 

 

 

 

 

(XCLK)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

 

RC Oscillator/DIVM (CCLK)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

00

 

High frequency crystal

 

 

 

 

 

 

 

(XCLK)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

01

 

Medium frequency crystal

 

 

 

 

 

 

 

(XCLK)

 

 

 

1

0

0

 

WDT Oscillator/DIVM

 

 

 

 

 

 

 

 

10

Low frequency crystal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(XCLK)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

 

WDT Oscillator/DIVM

 

 

 

 

 

 

 

(CCLK)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

0

1

xx

undefined

 

 

 

 

 

 

 

 

 

1

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

00

 

external clock

 

 

 

 

 

 

 

 

 

 

 

 

 

 

01

 

 

 

 

1

1

1

external clock/DIVM

(XCLK)

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

 

external clock/DIVM (CCLK)

 

 

 

 

 

 

 

 

 

 

 

2003 Dec 8

52

Page 52
Image 52
Philips P89LPC903 Real-time Clock/System Timer Clock Source P89LPC901, FOSC2 FOSC1 FOSC0 RTCS10, Xclk, Divm Cclk

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.