P89LPC970 datasheet(44/67 Pages) NXP

44 / 67 page

P89LPC97X

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Product data sheet

Rev. 3 — 8 June 2010

44 of 66

NXP Semiconductors

P89LPC970/971/972

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

Remark: Users who wish to use this loader should take precautions to avoid erasing the

1 kB sector that contains this bootloader. Instead, the page erase function can be used to

erase the first eight 64-byte pages located in this sector.

A custom bootloader can be written with the Boot Vector set to the custom bootloader, if

desired.

7.29.10 Hardware activation of the bootloader

The bootloader can also be executed by forcing the device into ISP mode during a

power-on sequence (see the P89LPC970/971/972 User manual for specific information).

This has the same effect as having a non-zero status byte. This allows an application to

be built that will normally execute user code but can be manually forced into ISP

operation. If the factory default setting for the boot is changed, it will no longer point to the

factory pre-programmed ISP bootloader code. 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.

7.30 User configuration bytes

Some user-configurable features of the P89LPC970/971/972 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 and UCFG2. Please see the

P89LPC970/971/972 User Manual for additional details.

7.31 User sector security bytes

There are four/eight User Sector Security Bytes on the P89LPC970/971/972. Each byte

corresponds to one sector. Please see the P89LPC970/971/972 User manual for

additional details.

Table 9.

Default boot vector values and ISP entry points

Device

Default

boot vector

Default

bootloader

entry point

Default bootloader

code range

1 kB sector

range

P89LPC970

07H

0700H

0600H to 07FFH

0400H to 07FFH

P89LPC971

0FH

0F00H

0E00H to 1FFFH

0C00H to 0FFFH

P89LPC972

1FH

1F00H

1E00H to 1FFFH

1C00H to 1FFFH

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