P87LPC779FDH datasheet(19/74 Pages) PHILIPS

19 / 74 page

Philips Semiconductors

P87LPC779

CMOS single-chip 8-bit microcontroller

Product data

Rev. 02 — 03 May 2004

19 of 74

9397 750 13213

8.6.2

Internal reference voltage

An internal reference voltage generator may supply a default reference when a single

comparator input pin is used. The value of the internal reference voltage, referred to

as Vref, is 1.28 V

±10 %.

Fig 7.

Comparator input and output connections.

Comparator 1

CP1

CN1

(P0.4) CIN1A

(P0.3) CIN1B

(P0.5) CMPREF

VREF

OE1

Change Detect

CO1

CMF1

Interrupt

Change Detect

CMF2

Interrupt

002aaa617

CMP1 (P0.6)

Comparator 2

OE2

CO2

CMP2 (P0.0)

CP2

CN2

(P0.2) CIN2A

(P0.1) CIN2B

CPn, CNn, OEn=000

CPn, CNn, OEn=001

CPn, CNn, OEn=010

CPn, CNn, OEn=011

CPn, CNn, OEn=100

CPn, CNn, OEn=101

CPn, CNn, OEn=110

CPn, CNn, OEn=111

Fig 8.

Comparator conﬁgurations.

CINnA

CMPREF

002aaa618

COn

CINnA

CMPREF

002aaa620

COn

CMPn

CINnA

VREF (1.23V)

002aaa621

COn

CINnA

VREF (1.23 V)

002aaa622

COn

CMPn

CINnB

CMPREF

002aaa623

COn

CINnB

CMPREF

002aaa624

COn

CMPn

CINnB

VREF (1.23V)

002aaa625

COn

CINnB

VREF (1.23 V)

002aaa626

COn

CMPn

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