Clock Source; Operating Mode; Schematic Diagram Of The Clock Interface; Operating Mode Selection - Motorola DSP56F803 Hardware User Manual

2.4 Clock Source

The DSP56F803EVM uses an 8.00MHz crystal, Y1, connected to its External Crystal
Inputs, EXTAL and XTAL. The DSP56F803 uses its internal PLL to multiply the input
frequency by 10 to achieve its 80MHz maximum operating frequency. An external
oscillator source can be connected to the DSP by using the oscillator bypass connectors,
JG3 and JG9; see Figure
Figure 2-3. Schematic Diagram of the Clock Interface

2.5 Operating Mode

The DSP56F803EVM provides a boot-up MODE selection jumper, JG4. This jumper is
used to select the operating mode of the DSP as it exits RESET. Refer to the DSP56F803
User's Manual for a complete description of the chip's operating modes.
the two operation modes available on the DSP56F803.
Operating Mode
0
3
2-6
2-3.
EXTERNAL
JG3
OSCILLATOR
HEADERS
8.00MHz
JG9
Table 2-2. Operating Mode Selection
JG4
1–2
No Jumper
DSP56F803EVM Hardware User's Manual
DSP56F803
EXTAL
XTAL
Comment
Bootstrap from internal memory (GND)
Bootstrap from external memory (+3.3V)
Table 2-2 shows