P89LPC904FD datasheet(31/41 Pages) PHILIPS

31 / 41 page

Philips Semiconductors

P89LPC904

8-bit microcontrollers with two-clock accelerated 80C51 core

Preliminary data

Rev. 02 — 25 June 2004

31 of 41

9397 750 13521

8.27 Flash program memory

8.27.1

General description

The P89LPC904 Flash memory provides in-circuit electrical erasure and

programming. The Flash can be erased, read, and written as bytes. The Sector and

Page Erase functions can erase any Flash sector (256 bytes) or page (16 bytes). The

Chip Erase operation will erase the entire program memory. In-Circuit Programming

using standard commercial programmers is available. In addition, In-Application

Programming (IAP) and byte erase allows code memory to be used for non-volatile

data storage. On-chip erase and write timing generation contribute to a user-friendly

programming interface. The P89LPC904 Flash reliably stores memory contents even

after more than 100,000 erase and program cycles. The cell is designed to optimize

the erase and programming mechanisms. The P89LPC904 uses VDD as the supply

voltage to perform the Program/Erase algorithms.

8.27.2

Features

• Programming and erase over the full operating voltage range.

• Byte-erase allowing code memory to be used for data storage.

• Read/Programming/Erase using ICP.

• Any ﬂash program/erase operation in 2 ms.

• Programming with industry-standard commercial programmers.

• Programmable security for the code in the Flash for each sector.

• More than 100,000 minimum erase/program cycles for each byte.

• 10-year minimum data retention.

8.27.3

Flash organization

The P89LPC904 program memory consists of four 256 byte sectors. Each sector can

be further divided into 16-byte pages. In addition to sector erase, page erase, and

byte erase, a 16-byte page register is included which allows from 1 to 16 bytes of a

given page to be programmed at the same time, substantially reducing overall

programming time. In addition, erasing and reprogramming of user-programmable

conﬁguration bytes including UCFG1, the Boot Status Bit, and the Boot Vector is

supported.

8.27.4

Flash programming and erasing

Different methods of erasing or programming of the Flash are available. The Flash

may be programmed or erased in the end-user application (IAP) under control of the

application’s ﬁrmware. Another option is to use the In-Circuit Programming (ICP)

mechanism. This ICP system provides for programming through a serial clock- serial

data interface. Third, the Flash may be programmed or erased using a commercially

available EPROM programmer which supports this device. This device does not

provide for direct veriﬁcation of code memory contents. Instead this device provides a

32-bit CRC result on either a sector or the entire 1 KB of user code space.

8.27.5

In-circuit programming (ICP)

In-Circuit Programming is performed without removing the microcontroller from the

system. The In-Circuit Programming facility consists of internal hardware resources

to facilitate remote programming of the P89LPC904 through a two-wire serial

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