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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TMP93CS44 датащи(PDF) 94 Page - Toshiba Semiconductor |
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TMP93CS44 датащи(HTML) 94 Page - Toshiba Semiconductor |
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94 / 224 page  TMP93CS44/S45 2004-02-10 93CS44-92 2. Generating a 50% duty square wave pulse The timer flip-flop is included in timer 1 and 3. The timer flip-flop (TFF3) is inverted at constant intervals, and its status is output to timer output pin (TO3). The output pin of TFF1 does not exist. Example: To output a 2.4 (s square wave pulse from TO3 pin at fc ( 20 MHz, set each register in the following procedures. Either timer 2 or timer 3 may be used, but this example uses timer 3. * Clock condition System clock: High frequency (fs) Clock gear: 1 (fc) Prescaler clock: fFPH 7 6 5 4 3 2 1 0 TRUN ← − X − − 0 − − − Stop timer 3, and clear it to “0”. T32MOD ← 0 0 X X 0 1 − − Set the 8-bit timer mode, and select φT1 (0.4 µs at fc = 20 MHz) as the input clock. TREG3 ← 0 0 0 0 0 0 1 1 Set the timer register at 2.4 µs ÷ φT1 ÷ 2 = 3. TFFCR ← 1 0 1 1 − − − − Set TFF3 to “0”, and set to invert by the match detect signal from timer 3. P4CR ← − − − − − − 1 − P4FC ← − X X − X X 1 X Select P41 as TO3 pin. TRUN ← − X − − 1 − − − Start timer 3 counting. X: Don’t care, −: No change Figure 3.7.10 Square Wave (50% duty) Output Timing Chart 1.2 µs at fc = 20 MHz 0 1 2 3 0 1 2 3 0 1 2 3 0 φT1 TRUN <T3RUN> Bit7 to 2 Bit1 Bit0 INTT3 TFF3 TO3 Up counter Comparator timing Comparator output (Matching detect) UC3 clear |
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