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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M37207MF датащи(PDF) 43 Page - Renesas Technology Corp |
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M37207MF датащи(HTML) 43 Page - Renesas Technology Corp |
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43 / 122 page  MITSUBISHI MICROCOMPUTERS M37207MF-XXXSP/FP, M37207M8-XXXSP M37207EFSP/FP SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER and ON-SCREEN DISPLAY CONTROLLER 42 Fig. 37. 14-bit PWM (DA) Output Example (at f(XIN) = 8 MHz) 250 ns b7 b0 b6 b5 b4 b3 b2 b1 0 0 01 011 0 b13 b6 0 0 010 110 b0 b5 1010 00 Set “2C16” to DA-H register. [DA-H register] DH At writing of DA-L b0 b6 b5 b4 b3 b2 b1 0 10 100 Set “2816” to DA-L register. [DA-L register] DL At writing of DA-L Undefined These bits decide “H” level area of fundamental waveform. These bits decide smaller interval “tm” in which “H” leval area is [“H” level area of fundamental waveform + τ ]. = Minimum resolution bit width 250 ns High-order 8-bit value of DA latch ! “H” level area of fundamental waveform FF 00 D3 FE FD … …… … D6 D4 02 01 D5 14-bit PWM output 8-bit counter 250 ns!44 FF 00 D3 FE FD D6 D4 02 01 D5 14-bit PWM output 8-bit counter 250 ns!44 Fundamental waveform Waveform of smaller interval “tm” specified by low-order 6 bits Fundamental waveform of smaller interval “tm” which is not specified by low-order 6 bits is not changed. 14-bit PWM output Low-order 6-bit output of DA latch 250 ns!44 τ = 250 ns T = 4096 µs Repeat period t0 t1 t2 t3 t4 t5 t59 t60 t61 t62 t63 [DA latch] b7 2C 2B 2A … 03 02 01 00 2C 2B 2A … 03 02 01 00 2D 2D Latch transfer complete bit Transfer complete Transfer is not completed (Automatically set at writing) 0 1 |
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