P87LPC768 NXP Semiconductors, P87LPC768 Datasheet - Page 33

• Manufacturer Part Number: P87LPC768
• Description: The P87LPC768 is a 20-pin single-chip microcontroller designed forlow pin count applications demanding high-integration, low costsolutions over a wide range of performance requirements
• Manufacturer: NXP Semiconductors

Philips Semiconductors
2002 Mar 12
Low power, low price, low pin count (20 pin) microcontroller
with 4 kB OTP 8-bit A/D, Pulse Width Modulator
THE OSCILLATOR MUST BE CONFIGURED IN ONE OF
THE FOLLOWING MODES:
– LOW FREQUENCY CRYSTAL
– MEDIUM FREQUENCY CRYSTAL
– HIGH FREQUENCY CRYSTAL
CAPACITOR VALUES MAY BE OPTIMIZED FOR
DIFFERENT OSCILLATOR FREQUENCIES (SEE TEXT)
THE OSCILLATOR MUST BE CONFIGURED IN
THE EXTERNAL CLOCK INPUT MODE.
A CLOCK OUTPUT MAY BE OBTAINED ON
THE X2 PIN BY SETTING THE ENCLK BIT IN
THE P2M1 REGISTER.
A SERIES RESISTOR MAY BE REQUIRED IN ORDER TO
LIMIT CRYSTAL DRIVE LEVELS. THIS IS PARTICULARLY
IMPORTANT FOR LOW FREQUENCY CRYSTALS (SEE TEXT).
CMOS COMPATIBLE EXTERNAL
Figure 20. Using an External Clock Input
Figure 19. Using the Crystal Oscillator
OSCILLATOR SIGNAL
CERAMIC RESONATOR
QUARTZ CRYSTAL OR
31
X1
X2
87LPC768
*
SU01390
X1
X2
87LPC768
P87LPC768
SU01389
Preliminary data