P89LPC925FDH datasheet(38/49 Pages) PHILIPS

38 / 49 page

Philips Semiconductors

P89LPC924/925

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

Product data

Rev. 03 — 15 December 2004

38 of 49

9397 750 14471

In-System Programming (ISP): In-System Programming is performed without

removing the microcontroller from the system. The In-System Programming facility

consists of a series of internal hardware resources coupled with internal ﬁrmware to

facilitate remote programming of the P89LPC924/925 through the serial port. This

ﬁrmware is provided by Philips and embedded within each P89LPC924/925 device.

The Philips In-System Programming facility has made in-system programming in an

embedded application possible with a minimum of additional expense in components

and circuit board area. The ISP function uses ﬁve pins (VDD, VSS, TXD, RXD, and

RST). Only a small connector needs to be available to interface your application to an

external circuit in order to use this feature. Please see the

P89LPC924/925 User’s

Manual for additional details.

In-Application Programming (IAP): Several In-Application Programming (IAP) calls

are available for use by an application program to permit selective erasing and

programming of Flash sectors, pages, security bits, conﬁguration bytes, and device

identiﬁcation. All calls are made through a common interface, PGM_MTP. The

programming functions are selected by setting up the microcontroller’s registers

before making a call to PGM_MTP at FF03H. Please see the

P89LPC924/925 User’s

Manual for additional details.

In-Circuit Programming (ICP): In-Circuit Programming is a method intended to

allow commercial programmers to program and erase these devices without

removing the microcontroller from the system. The In-Circuit Programming facility

consists of a series of internal hardware resources to facilitate remote programming

of the P89LPC924/925 through a two-wire serial interface. Philips has made in-circuit

programming in an embedded application possible with a minimum of additional

expense in components and circuit board area. The ICP function uses ﬁve pins (VDD,

VSS, P0.5, P0.4, and RST). Only a small connector needs to be available to interface

your application to an external programmer in order to use this feature.

8.26 User conﬁguration bytes

A number of user-conﬁgurable features of the P89LPC924/925 must be deﬁned at

power-up and therefore cannot be set by the program after start of execution. These

features are conﬁgured through the use of the Flash byte UCFG1. Please see the

P89LPC924/925 User’s Manual for additional details.

8.27 User sector security bytes

There are four or eight User Sector Security Bytes, depending on the device, each

corresponding to one sector. Please see the

P89LPC924/925 User’s Manual for

additional details.

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