Sony CXD5602 User Manual page 864

Calculation Equation
Sampling frequency
FREQ_LPADC = 32768/(2^SCU_U32KL)/(2^SAMP_RATIO)/(2^SEL_DIV)/(2^(one of N1 to N6))
INTERVAL = 32768/FREQ_LPADC
Calculation Equation
Sampling frequency:
FREQ_LPADC = 32768/(2^SCU_U32KL)/(2^SAMP_RATIO)/(2^SEL_DIV)/(2^(one of N1 to N6))
INTERVAL = 32768/FREQ_LPADC
HPADC
Obtains the values from the following related registers.
 32 kHz frequency division setting of TOPREG: CKDIV_SCU.SCU_U32KH(@0x4E4 ＋ TOPREG region)

XOSC frequency division register of SCU_ADCIF, common to the two HPADCs

HPADC_AC0.LV_CLK_XOSC_DIV(@0x0240 + PWD_SCU region)

When LV_CLK_XOSC_DIV == 0, XOSC_DIV = 2

When LV_CLK_XOSC_DIV == 1, XOSC_DIV = 3

When LV_CLK_XOSC_DIV == 2, XOSC_DIV = 4

When LV_CLK_XOSC_DIV == 3, XOSC_DIV = 6

Sets whether to use XOSC/RCOSC of SCU_ADCIF or 32 kHz input, for each HPADC

HPADC0_A0.LV_CLK_U32_SEL0(@0x0280 + PWD_SCU region)

HPADC1_A0.LV_CLK_U32_SEL1(@0x02C0 + PWD_SCU region)

Decimation ratio of CIC filter, for each HPADC

HPADC0_D1.DECI_RATIO(@0x0294 + PWD_SCU region)

HPADC1_D1.DECI_RATIO(@0x02D4 + PWD_SCU region)

Pick up the decimation ratio of CIC filter within MATH_PROC which is used

DECIMATION_PARAM0. N1 or N2 or N3(0x5084 PWD_SCU region)
or

DECIMATION_PARAM0. N4 or N5 or N6(0x5088 PWD_SCU region)

Set this to "0" when not using decimation
Calculation Equation
When LV_CLK_U32_SEL0/1 == 1
Sampling frequency:
FREQ_HPADC = 32768/(2^SCU_U32KH)/(2^DECI_RATIO)/(2^(one of N1 to N6))
When LV_CLK_U32_SEL0/1 == 0
When LV_CLK_OSC_SEL0 == 0 (XOSC is selected)
Sampling frequency:
FREQ_HPADC = XOSC frequency/XOSC_DIV/(2^DECI_RATIO)/4/(2^(one of N1 to N6))
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CXD5602 User Manual