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P89LPC903FD,112

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P51P52-P53
Philips Semiconductors
P89LPC901/902/903
8-bit microcontrollers with two-clock 80C51 core
Product data Rev. 05 — 17 December 2004 40 of 53
9397 750 14465
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
8.25 Additional features
8.25.1 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.
8.25.2 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.
8.26 Flash program memory
8.26.1 General description
The P89LPC901/902/903 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 bytes) or page (16 bytes). The
Chip Erase operation will erase the entire program memory. In-Circuit Programming
using standard commercial programmers is available. In addition, In-Application
Programming (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 P89LPC901/902/903 Flash reliably stores memory
contents even after more than 100,000 erase and program cycles. The cell is
(1) Watchdog reset can also be caused by an invalid feed sequence, or by writing to WDCON not immediately followed by a
feed sequence.
Fig 20. Watchdog timer in Watchdog mode (WDTE = ‘1’).
PRE2 PRE1 PRE0 – – WDRUN WDTOF WDCLK
WDCON (A7H)
CONTROL REGISTER
PRESCALER
002aaa423
SHADOW
REGISTER
FOR WDCON
8-BIT DOWN
COUNTER
WDL (C1H)
Watchdog
oscillator
PCLK
÷32
MOV WFEED1, #0A5H
MOV WFEED2, #05AH
RESET
see note (1)
Philips Semiconductors
P89LPC901/902/903
8-bit microcontrollers with two-clock 80C51 core
Product data Rev. 05 — 17 December 2004 41 of 53
9397 750 14465
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
designed to optimize the erase and programming mechanisms. The
P89LPC901/902/903 uses V
DD
as the supply voltage to perform the Program/Erase
algorithms.
8.26.2 Features
• Programming and erase over the full operating voltage range.
• Byte-erase allowing 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.
• More than 100,000 minimum erase/program cycles for each byte.
• 10-year minimum data retention.
8.26.3 Flash organization
The P89LPC901/902/903 program memory consists of four 256 byte sectors. Each
sector can be further divided into 16-byte pages. In addition to sector erase, page
erase, and byte erase, a 16-byte page register is included which allows from 1 to 16
bytes 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.
8.26.4 Flash programming and erasing
Different methods of erasing or programming of the Flash are available. The Flash
may be programmed or erased in the end-user application (IAP) under control of the
application’s firmware. Another option is to use the In-Circuit Programming (ICP)
mechanism. This ICP system provides for programming through a serial clock- serial
data interface. Third, the Flash may be programmed or erased using a commercially
available EPROM programmer which supports this device. This device does not
provide for direct verification of code memory contents. Instead this device provides a
32-bit CRC result on either a sector or the entire 1 KB of user code space.
8.26.5 In-circuit programming (ICP)
In-Circuit Programming is performed without removing the microcontroller from the
system. The In-Circuit Programming facility consists of internal hardware resources
to facilitate remote programming of the P89LPC901/902/903 through a two-wire
serial 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
P89LPC901/902/903 User’s
Manual
.
Philips Semiconductors
P89LPC901/902/903
8-bit microcontrollers with two-clock 80C51 core
Product data Rev. 05 — 17 December 2004 42 of 53
9397 750 14465
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
8.26.6 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
P89LPC901/902/903 User’s Manual
.
8.26.7 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.
8.26.8 User configuration bytes
Some user-configurable features of the P89LPC901/902/903 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
P89LPC901/902/903 User’s Manual
for additional details.
8.26.9 User sector security bytes
There are four User Sector Security Bytes, each corresponding to one sector. Please
see the
P89LPC901/902/903 User’s Manual
for additional details.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P51P52-P53

P89LPC903FD,112

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Manufacturer:
NXP Semiconductors
Description:
IC MCU 8BIT 1KB FLASH 8SO
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