DM16L Progs - Make It Tea

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====== DM16L Progs ======

** Some Programming aids... **

===== 65C22 Timer values =====

To calculate T1CH & T1CL values for an audio frequency tone generator (akin to the DM41X Ladybug version [[public:calculator:progs:dm41x_progs|]])

==== Counter calculation ====

The required count is calculated from ''Φ<sub>2</sub>'' and the audio frequency required.

Count (decimal) 

{ Φ<sub>2</sub> / ( 2 x F ) } - 2

for 1000Hz  and a 1MHz Φ<sub>2</sub> :

Count = { 1,000,000 / ( 2 X 1000 ) } - 2 = 498

498d -> $01F2


Start in DEC mode (and ''UNSIGNED'' integers)

put required audio tone frequency in X

<key>GSB</key><key>'A'</key>

Result is shown in ''hex''

e.g.

<key>DEC</key>
1000
<key>GSB</key><key>'A'</key>
Result ''001F2 H''

  $01F2


  T1CH = $01
  T1CL = $F2

The Program Listing

<code>

43,22,A   | g LBL A
44 0      | STO 0
2         | 20
0
42 44     | f WSIZE (i.e. WSIZE = 20)
1         | 1000000
0
0
0
0
0
0
45 0      | RCL 0
2         | 2
20        | x
10        | /
2         | 2
30        | -
23        | HEX
43 21     | g RTN
</code>


===== Version 2 =====

To calculate VIA T1 values with different CPU Φ<sub>2</sub> clock frequencies.

Switch to <key>DEC</key> mode. Set word size to 24.

Put required  CPU Φ<sub>2</sub> in Y and required audio freq. in X

<key>GSB</key><key>B</key>

Answer is in HEX.

e.g 1MHz  CPU Φ<sub>2</sub> and 1000Hz Audio


<key>1000000</key>
<key>Enter</key>
<key>1000</key> 
<key>GSB</key><key>B</key>
  
  0001F2 H
  
Timer values T1CL -> $F2 and T1CH -> $01

  
or for 4MHz and 100Hz (e.g. for a 10ms TICK)

<key>4000000</key>
<key>Enter</key>
<key>100</key>
<key>GSB</key><key>B</key>

  4E1E H
  
Timer values T1CL -> $1E and T1CH -> $4E


  * Routine B

<code>
42,22, B
44 0
34
44 1
2
4
42 44
45 1
45 0
2
20
10
2
30
23
43 21
</code>

--- //John Pumford-Green 07/08/22 07:14//


===== Further Information =====


{{tag>calculator dm16l}}

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