P89LPC913 datasheet(46/63 Pages) PHILIPS

46 / 63 page

Philips Semiconductors

P89LPC912/913/914

8-bit microcontrollers with two-clock 80C51 core

Product data

Rev. 03 — 17 December 2004

46 of 63

9397 750 14468

9.25 Additional features

9.25.1

Software reset

The SRST bit in AUXR1 gives software the opportunity to reset the processor

completely, as if an external reset or watchdog reset had occurred. Care should be

taken when writing to AUXR1 to avoid accidental software resets.

9.25.2

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.

9.26 Flash program memory

9.26.1

General description

The P89LPC912/913/914 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 P89LPC912/913/914 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 P89LPC912/913/914 uses

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

9.26.2

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.

9.26.3

Flash organization

The P89LPC912/913/914 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.

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