AT89LP52 Atmel Corporation, AT89LP52 Datasheet - Page 30
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AT89LP52
Manufacturer Part Number
AT89LP52
Description
Manufacturer
Atmel Corporation
Datasheet
1.AT89LP51.pdf
(117 pages)
Specifications of AT89LP52
Flash (kbytes)
8 Kbytes
Max. Operating Frequency
20 MHz
Cpu
8051-1C
Max I/o Pins
36
Uart
1
Sram (kbytes)
0.25
Eeprom (bytes)
256
Self Program Memory
IAP
Operating Voltage (vcc)
2.4 to 5.5
Timers
3
Isp
SPI
Watchdog
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89LP52-20AU
Manufacturer:
Atmel
Quantity:
250
Company:
Part Number:
AT89LP52-20JU
Manufacturer:
Atmel
Quantity:
110
Company:
Part Number:
AT89LP52-20MU
Manufacturer:
Atmel
Quantity:
490
6.2
6.3
30
External Clock Source
Internal RC Oscillator
AT89LP51/52
An optional 5 MΩ 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
Figure 6-2.
Note:
The external clock option disables the oscillator amplifier and allows XTAL1 to be driven directly
by an external clock source as shown in
general purpose I/O P4.7, or configured to output a divided version of the system clock.
Figure 6-3.
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.
1. C1, C2 = 5 pF ± 5pF for Crystals
Crystal Oscillator Connections
External Clock Drive Configuration
= 5 pF ± 5pF for Ceramic Resonators
C2
C1
OSCILLA T OR
EXTERNAL
NC GPIO
SIGNAL
Figure
(See “User Configuration Fuses” on page
6-3. XTAL2 may be left unconnected, used as
~10 pF
~10 pF
XT AL2 (P4.7)
XT AL1 (P4.6)
GND
R1
~5 MΩ
3709D–MICRO–12/11
86.)