P89LPC9301 datasheet(34/65 Pages) NXP

34 / 65 page

P89LPC9301_931A1_1

Preliminary data sheet

Rev. 01 — 9 April 2009

34 of 65

NXP Semiconductors

P89LPC9301/931A1

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

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.

Fig 12. SPI single master multiple slaves conﬁguration

002aaa903

master

slave

8-BIT SHIFT

SPI CLOCK

GENERATOR

8-BIT SHIFT

MISO

MOSI

SPICLK

port

MISO

MOSI

SPICLK

slave

8-BIT SHIFT

MISO

MOSI

SPICLK

P89LPC9301 Datasheet(PDF) 34 Page - NXP Semiconductors

P89LPC9301 Datasheet(HTML) 34 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65

Datasheet Download

Link URL