Morse Dial timer kit EEPROM usage  

03-26-2022, Chuck Olson, WB9KZY
email:  wb9kzy@wb9kzy.com

Here is a brief description of the EEPROM structure of
the Morse Dial Timer PIC.  It will allow those with a
PIC programmer to change the settings without having 
to use the menus.  Yes, it probably is possible to
mess up the working of the timer chip using this
information, if that happens, do a chip reset as
mentioned in the notes section of the manual to
restore the defaults (hopefully).

h refers to a hexadecimal number

EEPROM byte	default(hex)content	description of byte
-----------	-----------------------	-------------------
00h		4			Morse code speed, 4 = 20 wpm
01h		10h			various timer settings:
		0	bit 7	unused
		0	bit 6	unused
		0	bit 5	POL?	1=output on	0=output off	
		1	bit 4	KEY?	1=keying on	0=keying off    
		0	bit 3	unused
		0	bit 2	unused
		0	bit 1	unused
		0	bit 0	unused					
02h		3			command speed, 3 = 18 wpm
03h-3Fh		depends on user		start of message

message is stored as an ASCII string of characters  30h to 39h are 0-9, 41h to 5Ah are A-Z
	one byte = one character, message ends with a 0 byte (zero)
exceptions to ascii are some of the special characters
period .        3Ah
comma  ,        3Bh
END             3Ch 	note: this char is a run together END - used for end of msg
double slash BT 3Dh
slash /         3Eh 
?        	3Fh	note: question mark is an ascii char
SP       	40h

speeds refer to a speed table:
 0  10 wpm    
 1  12 wpm    
 2  15 wpm    
 3  18 wpm    
 4  20 wpm    
 5  25 wpm    
 6  30 wpm    
 7  35 wpm    
 8  40 wpm    
 9  50 wpm