P89LPC904FD datasheet(32/41 Pages) PHILIPS

32 / 41 page

Philips Semiconductors

P89LPC904

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

Preliminary data

Rev. 02 — 25 June 2004

32 of 41

9397 750 13521

interface. The Philips In-Circuit Programming facility has made in-circuit programming

in an embedded application, using commercially available programmers, possible

with a minimum of additional expense in components and circuit board area. The ICP

function uses ﬁve pins. Only a small connector needs to be available to interface your

application to a commercial programmer in order to use this feature. Additional details

may be found in the

P89LPC904 User’s Manual.

8.27.6

In-application programming

In-Application Programming is performed in the application under the control of the

microcontroller’s ﬁrmware. The IAP facility consists of internal hardware resources to

facilitate programming and erasing. The Philips In-Application Programming has

made in-application programming in an embedded application possible without

additional components. This is accomplished through the use of four SFRs consisting

of a control/status register, a data register, and two address registers. Additional

details may be found in the

P89LPC904 User’s Manual.

8.27.7

Using ﬂash as data storage

The Flash code memory array of this device supports individual byte erasing and

programming. Any byte in the code memory array may be read using the MOVC

instruction, provided that the sector containing the byte has not been secured (a

MOVC instruction is not allowed to read code memory contents of a secured sector).

Thus any byte in a non-secured sector may be used for non-volatile data storage.

8.27.8

User conﬁguration bytes

Some user-conﬁgurable features of the P89LPC904 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

P89LPC904

User’s Manual for additional details.

8.27.9

User sector security bytes

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

see the

P89LPC904 User’s Manual for additional details.

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