Philips Semiconductors

 

User’s Manual - Preliminary -

 

 

 

 

 

 

 

 

FLASH PROGRAM MEMORY

P89LPC901/902/903

 

 

 

 

 

 

 

 

 

 

unsigned char idata dbytes[16];

 

// data buffer

 

 

 

unsigned char Fm_stat;

// status result

 

bit PGM_USER (unsigned char, unsigned char); bit prog_fail;

void main ()

{

prog_fail=PGM_USER(0x1F,0xC0);

}

bit PGM_USER (unsigned char page_hi, unsigned char page_lo)

{

 

#define LOAD

0x00

// clear page register, enable loading

 

#define EP

0x68

// erase & program page

 

unsigned char

i;

// loop count

FMCON

=

LOAD;

//

//load command, clears page reg

FMADRH = page_hi;

 

FMADRL = page_lo;

//write my page address to addr regs

for

(i=0;i<16;i=i+1)

 

 

 

{

FMDATA = dbytes[i];

 

}

FMCON

EP;

//erase & prog page command

=

Fm_stat

= FMCON;

 

//read the result status

if ((Fm_stat & 0x0F)!=0) prog_fail=1; else prog_fail=0; return(prog_fail);

}

Figure 14-3: C-language routine to erase/program all or part of a page

Accessing additional flash elements

In addition to the user code array, the user’s firmware may access additional flash elements. These include UCFG1, the Boot Vector, Status Bit, and signature bytes. Access of these elements uses a slightly different method than that used to access the user code memory. Signature bytes are read-only. Security bytes may be erased only under certain conditions.

IAP-Lite is performed in the application under the control of the microcontroller’s firmware using four SFRs to facilitate erasing, programming, or reading. These SFRs are:

•FMCON (Flash Control Register). When read, this is the status register. When written, this is a command register. Note that the status bits are cleared to ’0’s when the command is written.

•FMDATA (Flash Data Register). Accepts data to be loaded into or from the flash element.

•FMADRL (Flash memory address low). Used to specify the flash element.

The flash elements that may be accessed and their addresses are shown in Table 14-1.

2003 Dec 8

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Philips P89LPC901, P89LPC903 Accessing additional flash elements, C-language routine to erase/program all or part of a
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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.
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