;********************************************************
;
;           The signboard control 2 processing
;
;                                 Author : Seiichi Inoue
;********************************************************

I wrote the title of the program using the comment( ; ).

        list            p=pic16f84a
        include         p16f84a.inc

Processor type is set by LIST directive.
The standard label definition of PIC16F84A is read by the INCLUDE directive.
As for the change of the standard label definition of PIC16F84A, refer to "Processing explanation of signboard".
Or you can use ERRORLEVEL directive to suppress the Warning messages.

 __config _hs_osc & _wdt_off & _pwrte_on & _cp_off

Configuration Word can be set when writing a program by the programmer. However, it is automatically established when using CONFIG directive.
As for the contents of operand, refer to "Processing explanation of signboard".



Item	Contents	Field name	Bit(s)
Code Protection	OFF	CP	1111111111
Power-up Timer	ON	PWRTE(inv)	0
Watchdog Timer	OFF	WDTE	0
Oscillator Selection	HS	FOSC1 and FOSC0	10

;**************  Debugging mode setting  ****************
;For debugging mode, ";" of next line should be removed.
;#define  _debug

It sometimes had better modify the part of the processing step when debugging software.
This time, the steps for timer is skiped for the debugging.
For the details, refer to "Debugging of Count-down timer".

;**************** Label Definition ********************

The labels for common use are defined.

;**************** Program Start ***********************

Instruction is executed from Zero addresses of the program memory when making the power ON of the PIC. When there is interruption processing, processing is begun from the addresse 4.

;**************** Initial Process *********************

The following processings are done as the initialization processing after the turning on.
Set mode of PORTA and PORTB to output
Set edge LED to CW
OFF all of the LEDs

;****************** Main Process **********************

In the main processing, various display effect subroutines are called in the order.
It makes display continuously in returning to the head with the last step.

;********************************************************
;*    Required effect processings are put below.        *
;********************************************************


;********************************************************
;*    Required effect processings are put above.        *
;********************************************************

The display effect processings are put on above-mentioned among two titles.
I put the label definition to use by the display effect processing in these too.

;*************** Interruption processing **************

In the processing this time, interruption processing isn't used. So, an interruption is ended in the RETFIE instruction.

;************* LED control Subroutine *****************

The contents of the screen table are controlled on the left from the right.
The control of PORTB is done by the byte unit. As it kept RB7 (The rotation data for the edge LED), it is rewriting only 7-bit data.
I put a wait in the about 100-u seconds to guarantee the operating time of the hardware after setting the data to PORTB and PORTA. This waiting time depends on the operation speed of CPLD.

;       <<< Timer  Subroutine for 10MHz clock  >>>

The following timer is preparatory as the software timer subroutine.
LED control waiting timer
1-msec timer
100-msec timer
500-msec timer
1-sec timer

As for the timer subroutine, refer to "Processing explanation of LED flasher".

;********************************************************
;          END of signboard control processing
;********************************************************

        end

At the end of coding, END directive is used.