P89LPC913 datasheet(48/66 Pages) NXP

48 / 66 page

P89LPC912_913_914_5

Product data sheet

Rev. 05 — 28 September 2007

48 of 66

NXP Semiconductors

P89LPC912/913/914

8-bit microcontrollers with two-clock 80C51 core

8.26 Additional features

8.26.1 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.

8.26.2 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.

8.27 Flash program memory

8.27.1 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 B) or page (16 B). The Chip Erase

operation will erase the entire program memory. ICP using standard commercial

programmers is available. In addition, 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 400000 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.

8.27.2 Features

• Programming and erase over the full operating voltage range.

• Byte erase allows 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.

• 400000 typical erase/program cycles for each byte.

• 20 year minimum data retention.

8.27.3 Flash organization

The P89LPC912/913/914 program memory consists of four 256 byte sectors. Each sector

can be further divided into 16 B pages. In addition to sector erase, page erase, and byte

erase, a 16 B page register is included which allows from 1 B to 16 B 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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