Motorola M68EZ328ADS user manual Operation Modes, LED Indicators, Operation Mode Setting

Freescale Semiconductor, Inc.

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

Freescale Semiconductor, Inc.

Hardware Description and Board Operation

3.4 OPERATION MODES

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

Mode and BootstrapARCHIVEDModeBY. SelectionFREESCALEof theseSEMICONDUCTOR,operation modesINCis .controlled2005 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 3-3shows the operation mode configuration.

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

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.

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

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

MOTOROLAM68EZ328ADS v2.0 USER’S MANUAL3-18

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