Motorola M68EZ328ADS - Manual (Page 19)

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.
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ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
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