Application Notes
M16C/26A Group
Sample Program (Message)
1.
Summary
This sample program receives the text data (message) input from the keyboard of a PC and shows the message on liquid crystal display
while at the same time writing it into the internal flash memory by using the Renesas Starter Kit for M16C/26A (R0K33026AS000BE).
(Straight type)
Received data
The extension board used here is a product
from PI System Co., Ltd.
2.
Introduction
Microcomputers: M16C26A
The example described in this document applies to the microcomputers listed below:
This sample program runs on the Renesas Starter Kit for M16C/26A (R0K33026AS000BE).
Prepare an extension board available for the Renesas Starter Kit or create a circuit similar to the one shown in the example circuit on page
14 and then connect it to the Starter Kit.
This program uses RSK_LIB. For details about RSK_LIB, see the RSK_LIB reference manual. (RSK_LIB is the library software provided
for use with the Renesas Starter Kit for M16C/26A.)
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Sample Program (Message)
3.
Port Arrangement
The terminal reception serial port is the facility mounted on an extension board for the Renesas Starter Kit. To use this facility, con
LCD
Terminal data reception
P71
P91
P90
P63
P62
P61
P60
LCD E
LCD RS
LCD D7
LCD D6
LCD D5
LCD D4
10MHz
Xin
P83
M30260F8AGP
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Sample Program (Message)
4.
Operational Outline
stored in the internal flash memory.
When a character is input to HyperTerminal (keyboard of a PC), the input character is shown on liquid crystal display and at the same time
Connect the serial port (RS-232C) of a PC and the D-sub connecter on the microcomputer side with a straight cable. When characters are
input to HyperTerminal, the input characters are shown on liquid crystal display on the microcomputer side. If while in this state SW1 is
depressed, the characters shown on liquid crystal display are written into the internal flash memory of the microcomputer. The result of a
write operation is shown on liquid crystal display, indicating whether the characters have been successfully written in.
Then, when the reset switch is depressed, the data written into memory immediately before that is redisplayed on liquid crystal display.
Up to 16 characters can be displayed, not including BS and TAB codes.
D-sub connector
Straight cable
A,B,C,D,E,F
ABCDEF
A
B
C
D
E
F
Liquid crystal display (LCD)
Internal flash memory
BLOCK A
0F800h
Personal computer (PC)
M16C26A
SW1/BOOT
0F810h
When SW1 is depressed, the data displayed
on LCD is saved in the internal flash memory.
The operation described above is accomplished using the following microcomputer facilities:
• Timer A0 (timer mode, main 2 ms cycle)
This timer counts 2 milliseconds using the main clock of the microcomputer as the count source.
It is used as the basic timer of RSK_LIB.
Time management and LCD display management are performed using this timer.
• UART2 (clock-asynchronous serial I/O mode, data reception)
It produces a transfer clock from the main clock of the microcomputer. The data transmitted via HyperTerminal is received using this
clock.
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Sample Program (Message)
5.
Operational Specification
(1) Reset switch depressed
(1) Immediately after the reset switch is depressed, a message if any
saved in the data flash area is displayed. If no messages are
saved in the data flash area (data = 0xff), nothing is displayed.
(2) The data received from the terminal is displayed.
Communication format
Baud rate: 9,600 bps
(In microcomputer, set at 9,615 bps)
Stop bit: 1
Parity: None
Number of characters received: 16
(Only up to 16 characters are accepted)
Received character code (written in ASCII)
Control code
TAB (0x09): Clear the displayed data
Clear the entire received string
BS (0x08): Backspace
Delete one character
(3) Press SW1 to write the currently displayed message into the data
flash.
(4) The result of a write to the data flash is displayed for 1 second.
When successfully written: Displayed as “Program success”
When erase error occurred: Displayed as “Erase error”
When program error occurred: Displayed as “Program error”
(5) TAB code is received, by which the display is cleared.
(6) After the reset switch is depressed, the saved data is displayed.
(5) TAB code received
P
r
o
g
r
a
s
m
s
(4) Write result displayed
a
i
b
c
(2) Character code received
(3) SW1 depressed
d
e
f
g
h
(data written)
s
u c c e
(6) Reset switch depressed
(saved data displayed)
a
i
b
c
d
e
f
g
h
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Sample Program (Message)
6.
Definition of the RSK Functionality and the RSK_LIB APIs and Common Functions Used by
Message Operation
6.1 Definition of the RSK Functionality
RSKdefine.h file
In this application, the following functionalities (those shown in red) are set.
/*********************************************************
The boot information on CPU is defined
Usually, this mode is used
*********************************************************/
//#define _CPU_M16C26A_NORMAL_MOD
/* Use in low power mode can be performed. */
//#define _CPU_M16C26A_32KHZ_MOD
/* Use of access of a flash can be performed. */
#define _CPU_M16C26A_DATAFLASF_USE
/********************************************************
The hardware function which RSK supports is chosen
/********************************************************/
//#define _USE_KEY
//#define _USE_BUZZER
//#define _OPTION_USE_AD
#define _OPTION_USE_COM_RX
//#define _OPTION_USE_COM_TX
//#define _OPTION_USE_INFRAEDRX
//#define _OPTION_USE_INFRAEDTX
#define _OPTION_USE_SW
//#define _OPTION_USE_LED
//#define _OPTION_USE_IO
Individual definition of each selected functionality
#if defined _OPTION_USE_SW
#define _OPTION_USE_PUSHSW1
//#define _OPTION_USE_PUSHSW2
//#define _OPTION_USE_PUSHSW3
#endif
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