16-14 MC68VZ328 User’s Manual

Application Development Design Example

16.5 Application Development Design Example

Figure 16-4 displays an example of an application development system design. This example is for initial

start-up designs and software development that occurs after the target hardware system is completed.

Figure 16-4. Application Development System Design Example

There is one reset switch and one abort switch. The abort switch is debounced and connected to the

EMUIRQ signal. The RESET signal is generated by the MC1455 monostable timer. The h ost int erface por t

is selected by the PAL decoding the EMUCS, A13, and A14 signals. The board also provides optional

SRAM and ROM plug-in sockets for expansion.

Host
Interface
RS-232
On-Board
Memory
Debug
EMUCS
D[15:0]
MC68VZ328
CPU
CSxx
ROM/RAM
68HC681
PC
EMUIRQ
10K
VDD
Abort
10K
VDD
Switch
PAL
A14
RAM/ROM
10K
VDD
Reset
10K
VDD
1N4148 1 M
0.47 µ 0.47 µ
0.1 µ
CV
TR
DIS
THR
Q
R
1 M
Switch
MC1455
RESET
and
ADI Port
A13
D[15:0] D[15:0]