Philips Semiconductors

User’s Manual - Preliminary -

 

 

 

 

 

 

FLASH PROGRAM MEMORY

P89LPC901/902/903

 

 

USER SECURITY BYTES

 

 

There are four User Sector Security Bytes (SEC0, ..., SEC3), each corresponding to one sector and having the following bit assignments:

SECx

 

 

 

7

 

6

 

5

4

 

3

2

1

0

 

 

Address: xxxxh

 

 

 

 

 

 

 

 

 

 

-

 

-

 

-

 

-

 

-

EDISx

SPEDISx

MOVCDISx

 

 

 

 

 

 

 

 

 

 

 

 

 

Unprogrammed value: 00h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BIT

 

SYMBOL

 

FUNCTION

 

 

 

 

 

 

 

 

 

 

 

 

SECx.7-3

-

 

Reserved (should remain unprogrammed at zero).

 

 

 

 

 

SECx.2

 

 

EDISx

 

Erase Disable x. Disables the ability to perform an erase of sector "x" in IAP mode. When

 

 

 

 

 

 

programmed, this bit and sector x can only be erased by a 'global' erase command using

 

 

 

 

 

 

a commercial programmer . This bit and sector x CANNOT be erased in IAP mode.

SECx.1

 

SPEDISx

 

Sector Program Erase Disable x. Disables program or erase of all or part of sector x.

 

 

 

 

 

 

This bit and sector x are erased by either a sector erase command (IAP or commercial

 

 

 

 

 

 

programmer) or a 'global' erase command (commercial programmer).

 

 

 

SECx.0

 

MOVCDISx

 

MOVC Disable. Disables the MOVC command for sector x. Any MOVC that attempts to

 

 

 

 

 

 

read a byte in a MOVC protected sector will return invalid data. This bit can only be erased

 

 

 

 

 

 

when sector x is erased.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 14-8: User Sector Security Bytes (SEC0 ... SEC3)

 

 

 

 

Table 14-2: Effects of Security Bits

 

 

 

 

 

 

 

 

 

 

 

 

EDISx

 

SPEDISx

MOVCDISx

 

 

 

 

 

 

Effects on Programming

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

0

 

0

None.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Security violation flag set for sector CRC calculation for the specific sector. Security

 

0

 

0

 

1

violation flag set for global CRC calculation if any MOVCDISx bit is set. Cycle aborted.

 

 

 

Memory contents unchanged. CRC invalid. Program/erase commands will not result

 

 

 

 

 

 

 

 

 

 

 

 

in a security violation.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

1

 

x

Security violation flag set for program commands or an erase page command. Cycle

 

 

 

aborted. Memory contents unchanged. Sector erase and global erase are allowed.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

x

 

x

Security violation flag set for program or erase commands. Cycle aborted. Memory

 

 

 

contents unchanged. Global erase is allowed.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2003 Dec 8

101

Page 101
Image 101
Philips P89LPC902, P89LPC901, P89LPC903 user manual User Security Bytes, SECx

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.