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SPEAR320S-2 データシート(PDF) 94 Page - STMicroelectronics |
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SPEAR320S-2 データシート(HTML) 94 Page - STMicroelectronics |
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94 / 113 page  Timing requirements SPEAr320S 94/113 Doc ID 022508 Rev 2 5.12 I2S timing characteristics Figure 27. I2S waveform 5.13 PWM timing characteristics This section describes the timing characteristics of the four PWM generators. Figure 28 shows two PWM waveforms in two example configurations programmed using the PWM registers. Figure 28. PWM timing waveforms Config. 1: Prescalerx = 0, Duty_reg_x = 2, Period_Reg_x = 4. Config. 2: Prescalerx = 1, Duty_reg_x = 2, Period_Reg_x = 4. Calculations (in PLCK periods): PWMxDuty = (Prescalerx +1) * Duty_reg_x PWMx Period = (Prescalerx +1) * (Period_Reg_x = 1 Table 69. I2S timing requirements Symbol Description Min Max Unit tCK I2S_CLK clock period 40 ns tD I2S_CLK to I2S_TX output delay 3.8 9 tS Setup time requirement for I2S_CLK 6 tH Hold time requirement for I2S_CLK 1 Th I2S_CLK I2S_TX, I2S_LR TCKhigh TCKlow Ts Tf Tr 2 x PCLK 3 x PCLK 6 x PCLK 4 x PCLK td PCLK PWMx (Config. 1) PWMx (Config. 2) |
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