Clock Source; Debug Leds; Schematic Diagram Of The Clock Interface; Led Control - Motorola 56F8323 User Manual

2.3 Clock Source

The 56F8323EVM uses on-chip 8.00MHz relaxation oscillator or the on-board 8.00MHz
crystal, Y1, connected to its External Crystal Inputs, EXTAL and XTAL. To achieve its
maximum internal operating frequency, the 56F8323 uses its internal PLL to multiply this
input clock frequency. Additionally an external oscillator source can be connected to the
DSP by using the oscillator bypass connectors, JG1 and JG2; see
frequency is above 8MHz, then the EXTAL input should be jumpered to ground by adding
a jumper between JG1 pins 2 and 3. The input frequency would then be injected on JG2's
pin 2. If the input frequency is below 4MHz, then the input frequency can be injected on
JG1's pin 2.
Figure 2-2. Schematic Diagram of the Clock Interface

2.4 Debug LEDs

Six on-board Light-Emitting Diodes, (LEDs), are provided to allow real-time debugging
for user programs. These LEDs will allow the programmer to monitor program execution
without having to stop the program during debugging; refer to
describes the control of each LED.
2-6
Freescale Semiconductor, Inc.
EXTERNAL
OSCILLATOR
HEADERS
JG1
1
2
3
8.00MHz
JG2
1
2
Table 2-4. LED Control
User LED Color
LED1 RED
LED2 YELLOW
LED3 GREEN
56F8323EVM User Manual
For More Information On This Product,
Go to: www.freescale.com
Figure
56F8323
EXTAL
XTAL
Figure
Controlled by
Signal
GPIO Port C Bit 0
GPIO Port C Bit 1
GPIO Port C Bit 2
2-2. If the input
2-3. Table 2-4
MOTOROLA