P89LPC9301(2009) View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

P89LPC9301
(Rev.:2009)

8-bit microcontroller with accelerated two-clock 80C51 core 4 kB/8 kB 3 V byte-erasable flash

NXP Semiconductors. 

NXP Semiconductors

P89LPC9301/931A1

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

MOV WFEED1, #0A5H

MOV WFEED2, #05AH

PCLK 0

watchdog 1

oscillator

0

crystal 1

÷32

oscillator

XTALWD

WDL (C1H)

PRESCALER

8-BIT DOWN

COUNTER

SHADOW REGISTER

reset(1)

WDCON (A7H) PRE2 PRE1 PRE0

-

-

WDRUN WDTOF WDCLK

002aae015

(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 14. Watchdog timer in Watchdog mode (WDTE = 1)

7.28 Additional features

7.28.1 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.

7.28.2 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.

7.29 Flash program memory

7.29.1 General description

The P89LPC9301/931A1 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 (1 kB) or page (64 bytes). 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 P89LPC9301/931A1 flash reliably stores

memory contents even after 100,000 erase and program cycles. The cell is designed to

P89LPC9301_931A1_1

Preliminary data sheet

Rev. 01 — 9 April 2009

© NXP B.V. 2009. All rights reserved.

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