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| 型號： | MC68HC805K3 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數(shù)： | 5/56頁 |
| 文件大小： | 311K |
| 代理商： | MC68HC805K3 |
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Application Note
Software Design Overview
AN1288
MOTOROLA
5
Figure 3
illustrates the main program flow of K3EEPROG.
To implement this program flow, functions must be implemented to
perform the following tasks:
1.
Provide a means to start execution of the MMDS/MMEVS host
software.
2.
Provide a means to control and stop the execution of the
MMDS/MMEVS host software once its execution has started.
3.
Communicate user commands and data to the MMDS/MMEVS.
4.
Communicate data and system responses, which can evaluate
and present them to the user, from the MMDS/MMEVS to
K3EEPROG.
Since the number of functions that K3EEPROG is required to perform is
small, a simple DOS text menu is sufficient as a user interface. The
menu provides the user with three commands:
Program PEEPROM
,
Read PEEPROM
, and
Exit to DOS
. Simple text-based prompts and
dialog boxes are used to display error messages, prompt for user data,
and display data.
A simple user interface serves to complement the first design
requirement, that of starting the MMDS or MMEVS operation from the
DOS environment. DOS provides a means of doing this with its spawn
feature. In DOS, a program can become dormant and spawn temporarily
or start the execution of another program, while remaining resident in the
computer’s memory. After the callee executes and exits to DOS,
execution of the caller resumes. The only constraint placed on the calling
and called programs is that they both must be able to fit in the host
computer’s memory at the same time. This size constraint limits the
complexity of the functionality of the utility and its user interface. This
was the method selected to launch the host software of the development
systems.
After spawning or starting the execution of the development system’s
host software, K3EEPROG becomes dormant but still must be able to
control the execution of the host software, directing the system to either
read or program the PEEPROM on the resident MCU. Also, when
programming the PEEPROM, data entered by the user must be
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