Freescale Semiconductor 56F8300 Series, Руководство пользователя

Страница: 25 / 76

Debug LEDs
Technical Summary, Rev. 1
Freescale Semiconductor 2-9
Preliminary
2.5.3 CLKMODE
The 56F8357EVM provides a Clock Boot Mode jumper, JG6. This jumper is used to select the
type of clock source being provided to the processor as it exits RESET. The user can select
between the use of a crystal or an oscillator as the clock source for the Processor. Refer to the
56F8300 Peripheral User Manual and the 56F8357 Technical Data Sheet for a complete
description of the chip’s operating modes. Table 2-5 shows the two CLKMODE operation
modes available on the 56F8357.
2.6 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
Figure 2-5 . Table 2-6 describes the control of
each LED.
Setting PC0, PC1, PC2, PC3, PD6, or PD7 to a Logic One value will turn on the associated LED.
Table 2-5. EMI Operating Mode Selection
Operating Mode JG6 Comment
Crystal 1–2 Enables the external clock drive logic so an external
crystal can be used as the input clock source. (GND)
Oscillator No Jumper Disables the external clock drive logic. Use oscillator
input on XTAL and Ground on EXTAL. (3.3V)
Table 2-6. LED Control
Controlled by
User LED Color Signal
LED1 RED Port C Bit 0 (PC0)
LED2 YELLOW Port C Bit 1 (PC1)
LED3 GREEN Port C Bit 2 (PC2)
LED4 RED Port C Bit 3 (PC3)
LED5 YELLOW Port D Bit 6 (PD6)
LED6 GREEN Port D Bit 7 (PD7)