P89LPC907FD datasheet(40/51 Pages) PHILIPS

40 / 51 page

Philips Semiconductors

P89LPC906/907/908

8-bit microcontrollers with two-clock 80C51 core

Product data

Rev. 05 — 17 December 2004

40 of 51

9397 750 14467

8.24.2

Dual data pointers

The dual Data Pointers (DPTR) provides two different Data Pointers to specify the

address used with certain instructions. The DPS bit in the AUXR1 register selects

one of the two Data Pointers. Bit 2 of AUXR1 is permanently wired as a logic ‘0’ so

that the DPS bit may be toggled (thereby switching Data Pointers) simply by

incrementing the AUXR1 register, without the possibility of inadvertently altering other

bits in the register.

8.25 Flash program memory

8.25.1

General description

The P89LPC906/907/908 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 P89LPC906/907/908 Flash reliably stores memory

contents even after 100,000 erase and program cycles. The cell is designed to

optimize the erase and programming mechanisms. The P89LPC906/907/908 uses

VDD as the supply voltage to perform the Program/Erase algorithms.

8.25.2

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 erase/program cycles for each byte.

• 10-year minimum data retention.

8.25.3

Flash organization

The P89LPC906/907/908 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.

8.25.4

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-Lite) 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

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