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

master

8-BIT SHIFT

REGISTER

SPI CLOCK

GENERATOR

MISO

MOSI

SPICLK

port

MISO

MOSI

SPICLK

SS

slave

8-BIT SHIFT

REGISTER

MISO

MOSI

slave

8-BIT SHIFT

REGISTER

SPICLK

port

SS

Fig 12. SPI single master multiple slaves configuration

002aaa903

7.25 Analog comparators

Two analog comparators are provided on the P89LPC9301/931A1. Input and output

options allow use of the comparators in a number of different configurations. Comparator

operation is such that the output is a logical one (which may be read in a register and/or

routed to a pin) when the positive input (one of two selectable inputs) is greater than the

negative input (selectable from a pin or an internal reference voltage). Otherwise the

output is a zero. Each comparator may be configured to cause an interrupt when the

output value changes.

The overall connections to both comparators are shown in Figure 13. The comparators

function to VDD = 2.4 V.

When each comparator is first enabled, the comparator output and interrupt flag are not

guaranteed to be stable for 10 µs. The corresponding comparator interrupt should not be

enabled during that time, and the comparator interrupt flag must be cleared before the

interrupt is enabled in order to prevent an immediate interrupt service.

When a comparator is disabled the comparator’s output, COn, goes HIGH. If the

comparator output was LOW and then is disabled, the resulting transition of the

comparator output from a LOW to HIGH state will set the comparator flag, CMFn. This will

cause an interrupt if the comparator interrupt is enabled. The user should therefore

disable the comparator interrupt prior to disabling the comparator. Additionally, the user

should clear the comparator flag, CMFn, after disabling the comparator.

P89LPC9301_931A1_1

Preliminary data sheet

Rev. 01 — 9 April 2009

© NXP B.V. 2009. All rights reserved.

34 of 65

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