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AT89LP51 Datasheet(PDF) 29 Page - ATMEL Corporation

Part # AT89LP51
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
PDF  113 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89LP51 Datasheet(HTML) 29 Page - ATMEL Corporation

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29
3709B–MICRO–12/10
AT89LP51/52 - Preliminary
An optional 5 M
Ω on-chip resistor can be connected between XTAL1 and GND. This resistor can
improve the startup characteristics of the oscillator especially at higher frequencies. The resistor
can be enabled/disabled with the R1 User Fuse (See “User Configuration Fuses” on page 86.)
Figure 6-2.
Crystal Oscillator Connections
Note:
1.
C1, C2 = 5 pF
± 5pF for Crystals
=5 pF
± 5pF for Ceramic Resonators
6.2
External Clock Source
The external clock option disables the oscillator amplifier and allows XTAL1 to be driven directly
by an external clock source as shown in Figure 6-3. XTAL2 may be left unconnected, used as
general purpose I/O P4.7, or configured to output a divided version of the system clock.
Figure 6-3.
External Clock Drive Configuration
6.3
Internal RC Oscillator
The AT89LP51/52 has an Internal Auxiliary oscillator tuned to 1.8432 MHz ±2.0%. When
enabled as the clock source, XTAL1 and XTAL2 may be used as P4.6 and P4.7 respectively.
~10 pF
~10 pF
C2
C1
R1
~5 M
Ω
XTAL2 (P4.7)
XTAL1 (P4.6)
GND
NC GPIO
EXTERNAL
OSCILLATOR
SIGNAL



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