AS3722 datasheet(78/199 Pages) AMSOSRAM

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ams Datasheet

Page 77

[v1-01] 2015-Sep-07

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AS3722 − Detailed Descriptions- System Functions

Figure 71:

ADC Timing Diagram

ADC Timing Diagram: Shows timing of the control and data signals of the internal ADC.

Real Time Clock

Description

The RTC module provides time information to the system. It is

implemented as second counter derived from the 32kHz

oscillator delivering the necessary accurate time base. The

actual time can be read from the second, minute, hour, day

month year registers in BCD format. Both 24h and am/pm mode

is supported. All counters are set to 0 at a power-on-reset. The

host controller can set the counter to any value by setting the

RTC registers.

To prevent ambiguous time information because some of the

registers being incremented before all of the registers have

been read or written, a parallel shadow register is implemented.

Every time a write/read access via the serial interface occurs the

parallel shadow register is updated with the current value of

the RTC counter. Any write access to the RTCsecond register will

disable the update of the parallel shadow register and set the

value of the appropriate byte of the parallel shadow register.

Any subsequent write access to the RTCyear register will

transfer the current value of the parallel shadow register to the

RTCsecond/minute/hour/…/year register and the update of the

parallel shadow register is enabled again. Similarly, any read

access to the RTCsecond register will freeze the current value

of the parallel shadow register and submit the appropriate byte

adc0_start_conversion

ADC clock

ADC on

ADC start

16us if adc_buf_on = 0

else 96us

adc0_result_not_ready

adc0_D[9:0]

result ready

result not valid

ADC eoc

16us if adc_buf_on = 0

else 96us

adc1_start_conversion

adc1_result_not_ready

adc1_D[9:0]

result ready

result not valid

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