Philips Semiconductors

 

 

 

 

 

 

 

 

 

User’s Manual - Preliminary -

 

 

 

 

 

 

 

 

 

 

 

 

 

 

POWER MONITORING FUNCTIONS

 

P89LPC901/902/903

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PCON

 

7

6

 

5

4

3

2

 

1

0

 

 

 

Address: 87h

 

 

SMOD1

SMOD0

 

BOPD

BOI

GF1

GF0

 

PMOD1

PMOD0

 

 

 

Not bit addressable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset Source(s): Any reset

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset Value:

00000000B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BIT

SYMBOL

FUNCTION

 

 

 

 

 

 

 

 

 

 

 

 

PCON.7

SMOD1

Double Baud Rate bit for the serial port (UART) when Timer 1 is used as the baud rate

 

 

 

 

source. When 1, the Timer 1 overflow rate is supplied to the UART. When 0, the Timer 1

 

 

 

 

overflow rate is divided by 2 before being supplied to the UART. (See Figure 8-2).

 

 

PCON.6

SMOD0

Framing Error Location:

 

 

 

 

 

 

 

 

 

 

 

 

-When 0, bit 7 of SCON is accessed as SM0 for the UART.

 

 

 

 

 

 

 

-When 1, bit 7 of SCON is accessed as the framing error status (FE) for the UART.

 

 

 

 

This bit also determines the location of the UART receiver interrupt RI (see description

 

 

 

 

on RI in Figure 8-3).

 

 

 

 

 

 

 

 

 

 

PCON.5

BOPD

Brownout Detect Power down. When 1, Brownout Detect is powered down and therefore

 

 

 

 

disabled. When 0, Brownout Detect is enabled. (Note: BOPD must be ’0’ before any

 

 

 

 

programming or erasing commands can be issued. Otherwise these commands will be

 

 

 

 

aborted.)

 

 

 

 

 

 

 

 

 

 

 

 

PCON.4

BOI

Brownout Detect Interrupt Enable. When 1, Brownout Detection will generate a interrupt .

 

 

 

 

When 0, Brownout Detection will cause a reset.

 

 

 

 

 

 

 

PCON.3

GF1

General Purpose Flag 1. May be read or written by user software, but has no effect on

 

 

 

 

operation.

 

 

 

 

 

 

 

 

 

 

 

 

PCON.2

GF0

General Purpose Flag 0. May be read or written by user software, but has no effect on

 

 

 

 

operation.

 

 

 

 

 

 

 

 

 

 

 

 

PCON.1-0

PMOD1-PMOD0

Power Reduction Mode (see section "Power Reduction Modes").

 

 

 

 

Figure 7-1: Power Control Register (PCON)

2003 Dec 8

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Philips P89LPC903, P89LPC901, P89LPC902 user manual Pcon

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.