P89LPC930FDH datasheet(40/55 Pages) PHILIPS

40 / 55 page

Philips Semiconductors

P89LPC930/931

8-bit microcontrollers with two-clock 80C51 core

Product data

Rev. 05 — 15 December 2004

40 of 55

9397 750 14472

the Boot Vector and Boot Status Bit. After programming the Flash, the status byte

should be programmed to zero in order to allow execution of the user’s application

code beginning at address 0000H.

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 P89LPC930/931 through the serial port. This

ﬁrmware is provided by Philips and embedded within each P89LPC930/931 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.

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

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

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

device id. 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 FF00H.

8.25 User conﬁguration bytes

A number of user-conﬁgurable features of the P89LPC930/931 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

P89LPC930/931 User’s Manual for additional details.

8.26 User sector security bytes

There are eight User Sector Security Bytes, each corresponding to one sector.

Please see the

P89LPC930/931 User’s Manual for additional details.

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