P89LPC9151FDH datasheet(46/91 Pages) NXP

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P89LPC9151_61_71_2

Product data sheet

Rev. 02 — 9 February 2010

46 of 91

NXP Semiconductors

P89LPC9151/9161/9171

8-bit microcontroller with 8-bit ADC

Every output on the P89LPC9151/9161/9171 has been designed to sink typical LED drive

current. However, there is a maximum total output current for all ports which must not be

exceeded. Please refer to Table 16 “Static characteristics” for detailed specifications.

All ports pins that can function as an output have slew rate controlled outputs to limit noise

generated by quickly switching output signals. The slew rate is factory-set to

approximately 10 ns rise and fall times.

7.16 Power monitoring functions

The P89LPC9151/9161/9171 incorporates power monitoring functions designed to

prevent incorrect operation during initial power-up and power loss or reduction during

operation. This is accomplished with two hardware functions: Power-on detect and

brownout detect.

7.16.1 Brownout detection

The brownout detect function determines if the power supply voltage drops below a

certain level. Enhanced brownout detection has 3 independent functions: BOD reset,

BOD interrupt and BOD FLASH.

BOD reset is always on except in total Power-down mode. It could not be disabled in

software. BOD interrupt may be enabled or disabled in software. BOD FLASH is always

on, except in Power-down modes and could not be disabled in software.

BOD reset and BOD interrupt, each has four trip voltage levels. BOE1 bit (UCFG1.5) and

BOE0 bit (UCFG1.3) are used as trip point configuration bits of BOD reset. BOICFG1 bit

and BOICFG0 bit in register BODCFG are used as trip point configuration bits of BOD

interrupt. BOD reset voltage should be lower than BOD interrupt trip point. BOD FLASH is

used for flash programming/erase protection and has only 1 trip voltage of 2.4 V. Please

refer to P89LPC9151/9161/9171 User manual for detail configurations.

If brownout detection is enabled the brownout condition occurs when VDD falls below the

brownout trip voltage and is negated when VDD rises above the brownout trip voltage.

For correct activation of brownout detect, the VDD rise and fall times must be observed.

Please see Table 16 “Static characteristics” for specifications.

7.16.2 Power-on detection

The Power-on detect has a function similar to the brownout detect, but is designed to work

as power comes up initially, before the power supply voltage reaches a level where

brownout detect can work. The POF flag in the RSTSRC register is set to indicate an

initial power-up condition. The POF flag will remain set until cleared by software.

7.17 Power reduction modes

The P89LPC9151/9161/9171 supports three different power reduction modes. These

modes are Idle mode, Power-down mode, and total Power-down mode.

7.17.1 Idle mode

Idle mode leaves peripherals running in order to allow them to activate the processor

when an interrupt is generated. Any enabled interrupt source or reset may terminate Idle

mode.

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