DSP56F807VF80 Freescale Semiconductor, DSP56F807VF80 Datasheet - Page 30

• Manufacturer Part Number: DSP56F807VF80
• Description: IC DSP 80MHZ 60K FLASH 160-BGA
• Manufacturer: Freescale Semiconductor
• Series: 56F8xxr

Specifications of DSP56F807VF80

• Core Processor: 56800
• Core Size: 16-Bit
• Speed: 80MHz
• Connectivity: CAN, EBI/EMI, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 136KB (68K x 16)
• Program Memory Type: FLASH
• Ram Size: 6K x 16
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 160-MAPBGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

as a typical circuit board trace capacitance the parallel load capacitance presented to the crystal is 9pF as
determined by the following equation:
This is the value load capacitance that should be used when selecting a crystal and determining the actual
frequency of operation of the crystal oscillator circuit.
3.4.2
It is also possible to drive the internal oscillator with a ceramic resonator, assuming the overall system
design can tolerate the reduced signal integrity. In
shown. Refer to supplier’s recommendations when selecting a ceramic resonator and associated
components. The resonator and components should be mounted as close as possible to the EXTAL and
XTAL pins. The internal 56F80x oscillator circuitry is designed to have no external load capacitors
present. As shown in
30
Note: Freescale recommends only two terminal ceramic resonators vs. three terminal resonators
(which contain an internal bypass capacitor to ground).
Ceramic Resonator
Figure 3-7
CL =
Figure 3-7 Connecting to a Crystal Oscillator
Figure 3-8 Connecting a Ceramic Resonator
CL1 * CL2
CL1 + CL2
EXTAL XTAL
EXTAL XTAL
56F807 Technical Data Technical Data, Rev. 16
no external load capacitors should be used.
R
f
R
f
c
c
z
z
+ Cs =
Recommended External Crystal
Parameters:
R
f
Recommended Ceramic Resonator
Parameters:
R
f
c
c
z
z
= 8MHz (optimized for 8MHz)
= 8MHz (optimized for 8MHz)
= 1 to 3 MΩ
= 1 to 3 MΩ
12 * 12
12 + 12
Figure
3-8, a typical ceramic resonator circuit is
+ 3 = 6 + 3 = 9pF
Freescale Semiconductor