<-[[.:start]] ====== 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 ''Φ₂'' and the audio frequency required. Count (decimal) { Φ₂ / ( 2 x F ) } - 2 for 1000Hz and a 1MHz Φ₂ : 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 GSB'A' Result is shown in ''hex'' e.g. DEC 1000 GSB'A' Result ''001F2 H'' $01F2 T1CH = $01 T1CL = $F2 The Program Listing 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 ===== Version 2 ===== To calculate VIA T1 values with different CPU Φ₂ clock frequencies. Switch to DEC mode. Set word size to 24. Put required CPU Φ₂ in Y and required audio freq. in X GSBB Answer is in HEX. e.g 1MHz CPU Φ₂ and 1000Hz Audio 1000000 Enter 1000 GSBB 0001F2 H Timer values T1CL -> $F2 and T1CH -> $01 or for 4MHz and 100Hz (e.g. for a 10ms TICK) 4000000 Enter 100 GSBB 4E1E H Timer values T1CL -> $1E and T1CH -> $4E * Routine B 42,22, B 44 0 34 44 1 2 4 42 44 45 1 45 0 2 20 10 2 30 23 43 21 --- //John Pumford-Green 07/08/22 07:14// ===== Further Information ===== {{tag>}} --- //John Pumford-Green 24/04/23 16:06// ===== Further Information ===== {{tag>}}