Philips Semiconductors

User’s Manual - Preliminary -

Table of Contents

P89LPC901/902/903

 

Mode 6 - P89LPC901

47

 

Timer Overflow toggle output - P89LPC901

49

6.

Real-Time Clock/System Timer

51

 

Real-time Clock Source

51

 

Changing RTCS1-0

53

 

Real-time Clock Interrupt/Wake Up

53

 

Reset Sources Affecting the Real-time Clock

53

7.

Power Monitoring Functions

55

 

Brownout Detection

55

 

Power-On Detection

56

 

Power Reduction Modes

57

8. UART (P89LPC903)

61

 

Mode 0

61

 

Mode 1

61

 

Mode 2

61

 

Mode 3

61

 

SFR Space

62

 

Baud Rate Generator and Selection

62

 

Updating the BRGR1 and BRGR0 SFRs

62

 

Framing Error

63

 

Break Detect

63

 

More About UART Mode 0

65

 

More About UART Mode 1

66

 

More About UART Modes 2 and 3

67

 

Framing Error and RI in Modes 2 and 3 with SM2 = 1

67

 

Break Detect

67

 

Double Buffering

68

 

Double Buffering in Different Modes

68

 

Transmit Interrupts with Double Buffering Enabled (Modes 1, 2 and 3) .. 68

 

The 9th Bit (Bit 8) in Double Buffering (Modes 1, 2 and 3)

69

 

Multiprocessor Communications

70

 

Automatic Address Recognition

70

9.

Reset

73

 

Power-On reset code execution

73

10. Analog Comparators

75

 

Comparator Configuration

75

 

Internal Reference Voltage

77

 

Comparator Interrupt

77

 

Comparator and Power Reduction Modes

78

 

Comparator Configuration Example

78

11.

Keypad Interrupt (KBI)

79

12. Watchdog Timer

83

 

Watchdog Function

83

2003 Dec 8

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Philips P89LPC901, P89LPC903, P89LPC902 user manual Power Monitoring Functions

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.