User`s manual

Hardware Description and Board Operation

MOTOROLA M68EZ328ADS v2.0 USER’S MANUAL 3-18

3.4 OPERATION MODES

M68EZ328ADS v2.0 supports three operation modes of MC68EZ328: EMU Mode, Normal

Mode and Bootstrap Mode. Selection of these operation modes is controlled by DIP switch

S2-8. Operation mode has to be selected before resetting the system. Mode is not allowed

to change during normal running. Table 3-3 shows the operation mode configuration.

Normal Mode - After power up or system reset in this mode, CSA0 is default to cover the

whole memory map except MC68EZ328 internal registers and EMU space. Also, as reset

vector fetch is at the beginning of CSA0 space, CSA0 should be connected to the boot ROM

in which the first two words are reset vectors.

Bootstrap Mode - When this mode is selected, the DragonBall-EZ will start its embedded

bootloader. User can use this mode to do simple debugging or reprogram the flash memo-

ries. For detailed bootstrap mode operation, please refer MC68EZ328 user’s manual.

EMU Mode - When this mode is selected, the reset vectors are generated internally by the

ICE module of MC68EZ328. The first instruction fetch is at $FFFC0020. Therefore, in EMU

mode the debug monitor of MC68EZ328ADS v2.0 is located beginning at $FFFC0020.

EMUCS is always running in 8-bit data bus mode covering the address space from

$FFFC0000 to $FFFD0000

3.5 LED INDICATORS

There are four LED indicators on the ADS which function as shown in Table 3-4.

The LED3 is connected to a counter. The counter is toggled by address line A1.

Table 3-3. Operation Mode Setting

DIP Switch S2-4 DIP Switch S2-5 Operation Mode

ON OFF EMU

OFF OFF Normal

ON ON Bootstrap

OFF ON Bootstrap

Table 3-4. Function of LED Indicators

Reference # Color Name Function

LED3 Yellow PD0 Status of PD0

LED4 Yellow PD1 Status of PD1

LED1 Red Heart Beat Blinking heart beat indicates the system is "alive"

LED2 Green Power Power is applied to the system with right polarity

Freescale Semiconductor, I

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

nc...

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005