AT89S8253-24JC Atmel, AT89S8253-24JC Datasheet - Page 33

• Manufacturer Part Number: AT89S8253-24JC
• Description: IC 8051 MCU FLASH 12K 44PLCC
• Manufacturer: Atmel
• Series: 89Sr

Specifications of AT89S8253-24JC

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 24MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, WDT
• Number Of I /o: 32
• Program Memory Size: 12KB (12K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-PLCC
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI, UART
• Maximum Clock Frequency: 24 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3 bit
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -
• Lead Free Status / Rohs Status: No

16. Oscillator Characteristics
3286P–MICRO–3/10
XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier that can be
configured for use as an on-chip oscillator, as shown in
crystal or ceramic resonator may be used. For frequencies above 16MHz it is recommended that
C1 be replaced with R1 for improved startup performance. Note that the internal structure of the
devices adds about 10 pF of capacitance to both XTAL1 and XTAL2. The total capacitance on
XTAL1 or XTAL2, including the external load capacitor (C1/C2) plus internal device load, board
trace and crystal loadings, should not exceed 20 pF.
the relationship between clock loading and the respective resulting clock amplitudes.
Figure 16-1. Oscillator Connections
Note:
Figure 16-2. Quartz Crystal Clock Source (A)
C1, C2 = 0–10 pF for Crystals
R1
6
5
4
3
2
1
0
0
(A) Low Frequency
= 0–10 pF for Ceramic Resonators
= 4–5 MΩ
C2
C1
4
Quartz Crystal Clock Input
8
~10 pF
~10 pF
Frequency (MHz)
12
Figure
(B) High Frequency
16
Figure 16-1
C2
R1
16-2, 16-3,
20
(A) and (B). Either a quartz
C1=C2=0pF
C1=C2=5pF
C1=C2=10pF
16-4
AT89S8253
and
24
~10 pF
~10 pF
16-5
illustrate
33