AT89LP52-20MU Atmel, AT89LP52-20MU Datasheet - Page 29

• Manufacturer Part Number: AT89LP52-20MU
• Description: IC MCU 8051 8K FLASH SPI 44VQFN
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP52-20MU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-VFQFN Exposed Pad
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: Serial
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

6.2
6.3
3709B–MICRO–12/10
External Clock Source
Internal RC Oscillator
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
AT89LP51/52 - Preliminary
(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
86.)
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