Philips Semiconductors

 

 

User’s Manual - Preliminary -

 

 

 

 

 

 

 

 

 

FLASH PROGRAM MEMORY

P89LPC901/902/903

 

 

Table 14-1: Flash elements accesable through IAP-Lite

 

 

 

 

Element

Address Description

 

 

 

 

UCFG1

00h

User Configuration byte 1.

 

 

 

 

Boot Vector

 

 

 

 

 

 

02h

Boot vector

 

 

 

 

Status Bit

03h

Status bit byte

 

 

 

 

Security

08h

Security byte, sector 0

 

 

 

 

byte 0

 

 

 

 

 

 

Security

09h

Security byte, sector 1

 

 

 

 

byte 1

 

 

 

 

 

 

Security

0Ah

Security byte, sector 2

 

 

 

 

byte 2

 

 

 

 

 

 

Security

0Bh

Security byte, sector 3

 

 

 

 

byte3

 

 

 

 

 

 

Mfgr Id

10h

Signature byte, manufacturer id

 

 

 

 

Id_1

11h

Signature byte,id 1

 

 

 

 

Id_2

12h

Signature byte,id 2

 

 

 

Erase-programming additional flash elements

The erase-program cycle takes 4ms to complete and is accomplished using the following steps:

Write the address of the flash element to FMADRL.

Write the CONF command (6CH) to FMCON.

Write the data to be programmed to FMDATA.

Read FMCON to check status. If aborted, repeat this sequence.

Writing the data to be programmed to FMDATA will start the erase-program process and place the CPU in a program-idle state. The CPU will remain in this idle state until the erase-program cycle is either completed or terminated by an interrupt. When the program-idle state is exited, FMCON will contain status information for the cycle.

If an interrupt occurs during an erase/programming cycle, the erase/programming cycle will be aborted and the OI flag (Opera- tion Interrupted) in FMCON will be set. If the application permits interrupts during erasing-programming the user code should check the OI flag (FMCON.0) after each erase-programming operation to see if the operation was aborted. If the operation was aborted, the user’s code will need to repeat the process.

Reading additional flash elements

The read cycle is accomplished using the following steps:

Write the address of the flash element to FMADRL.

Write the CONF command (6CH) to FMCON.

Read the data from FMDATA

The read cycle completes in a single machine cycle and thus will not enter an idle state. It can be interrupted. However, there is no need to check status.

An assembly language routine to perform an erase/program operation of a flash element is shown in Figure 14-4. A similar C- language routine is shown in Figure 14-5. A C-language routine to read a flash element is shown in Figure 14-6.

2003 Dec 8

97

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Philips P89LPC903, P89LPC901 Erase-programming additional flash elements, Reading additional flash elements, UCFG1

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.