Philips Semiconductors
Preliminary data
Low power, low price, low pin count (20 pin)
microcontroller with 4 kbyte OTP
87LPC764
CP1
(P0.4) CIN1A
(P0.3) CIN1B
(P0.5) CMPREF
V
ref
CN1
COMPARATOR 1
+
CO1
CMP1 (P0.6)
–
OE1
CHANGE DETECT
CMF1
INTERRUPT
CP2
(P0.2) CIN2A
(P0.1) CIN2B
COMPARATOR 2
+
CO2
CMP2 (P0.0)
–
CN2
OE2
CHANGE DETECT
CMF2
INTERRUPT
SU01153
Figure 3. Comparator Input and Output Connections
CPn, CNn, OEn = 0 0 0
CPn, CNn, OEn = 0 0 1
CINnA
CMPREF
+
COn
CINnA
CMPREF
+
–
COn
–
CMPn
CPn, CNn, OEn = 0 1 0
CPn, CNn, OEn = 0 1 1
CINnA
Vref (1.23V)
+
COn
CINnA
V
ref
(1.23V)
+
–
COn
CMPn
–
CPn, CNn, OEn = 1 0 0
CPn, CNn, OEn = 1 0 1
CINnB
CMPREF
+
COn
CINnB
CMPREF
+
–
COn
CMPn
–
CPn, CNn, OEn = 1 1 0
CPn, CNn, OEn = 1 1 1
CINnB
V
ref
(1.23V)
+
COn
CINnB
V
ref
(1.23V)
+
–
COn
CMPn
–
SU01154
Figure 4. Comparator Configurations
2001 Oct 26
9
PHILIPS [ NXP SEMICONDUCTORS ]
