Clock Source; Debug Leds; Block Diagram Of The Clock Interface; Block Diagram Of The Debug Led Interface - Motorola DSP56F801 Hardware User Manual

2.3 Clock Source

The DSP56F801EVM uses an 8.00MHz crystal, Y1, connected to its External Crystal
Inputs, EXTAL and XTAL. The DSP56F801 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 connector,
JG7 and JG8; see Figure
Figure 2-2. Block Diagram of the Clock Interface

2.4 Debug LEDs

One on-board Light-Emitting Diode (LED) is provided to allow real-time debugging for
user programs. This LED allows the programmer to monitor program execution without
having to stop the program during debugging; refer to
designated LED7, is controlled by the MOSI signal. Setting the MOSI to a Logic One
value will turn on the LED.
Figure 2-3. Block Diagram of the Debug LED Interface
2-2.
EXTERNAL
OSCILLATOR
HEADERS
JG7
1
3
8.00MHz
10M
JG8
1
DSP56F801
INVERTING BUFFER
MOSI
Technical Summary
DSP56F801
EXTAL
2
XTAL
2
Figure 2-3. This user LED,
GREEN LED
Debug LEDs
+3.3V
2-5