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Chapter 9 Analog-to-Digital Converter (ADC12B_LBA_V1)
MC9S12ZVM Family Reference Manual Rev. 1.3
Freescale Semiconductor
351
Please note that there is always a pump phase of two ADC_CLK cycles before the sample phase begins,
hence glitches during the pump phase could impact the conversion accuracy for short sample times.
9.5.3
Digital Sub-Block
The digital sub-block contains a list-based programmer’s model and the control logic for the analog
sub-block circuits.
9.5.3.1
Analog-to-Digital (A/D) Machine
The A/D machine performs the analog-to-digital conversion. The resolution is program selectable to be
either 8- or 10- or 12 bits. The A/D machine uses a successive approximation architecture. It functions by
comparing the sampled and stored analog voltage with a series of binary coded discrete voltages.
By following a binary search algorithm, the A/D machine identifies the discrete voltage that is nearest to
the sampled and stored voltage.
Only analog input signals within the potential range of VRL_0/1 to VRH_0/1 (A/D reference potentials)
will result in a non-railed digital output code.
9.5.3.2
Introduction of the Programmer’s Model
The ADC_LBA provides a programmer’s model that uses a system memory list-based architecture for
definition of the conversion command sequence and conversion result handling.
The Command Sequence List (CSL) and Result Value List (RVL) are implemented in double buffered
manner and the buffer mode is user selectable for each list (bits CSL_BMOD, RVL_BMOD). The 32-bit
wide conversion command is double buffered and the currently active command is visible in the ADC
register map at ADCCMD register space.
Содержание MC9S12ZVM series
Страница 116: ...Chapter 2 Port Integration Module S12ZVMPIMV1 MC9S12ZVM Family Reference Manual Rev 1 3 116 Freescale Semiconductor ...
Страница 242: ...Chapter 7 ECC Generation Module SRAM_ECCV1 MC9S12ZVM Family Reference Manual Rev 1 3 242 Freescale Semiconductor ...
Страница 384: ...Chapter 10 Supply Voltage Sensor BATSV3 MC9S12ZVM Family Reference Manual Rev 1 3 384 Freescale Semiconductor ...
Страница 484: ...Chapter 13 Programmable Trigger Unit PTUV2 MC9S12ZVM Family Reference Manual Rev 1 3 484 Freescale Semiconductor ...
Страница 662: ...Chapter 17 Gate Drive Unit GDUV4 MC9S12ZVM Family Reference Manual Rev 1 3 662 Freescale Semiconductor ...
Страница 684: ...Chapter 18 LIN Physical Layer S12LINPHYV2 MC9S12ZVM Family Reference Manual Rev 1 3 684 Freescale Semiconductor ...
Страница 740: ...Chapter 19 128 KB Flash Module S12ZFTMRZ128K512V2 MC9S12ZVM Family Reference Manual Rev 1 3 740 Freescale Semiconductor ...
Страница 756: ...Appendix A MCU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 756 Freescale Semiconductor ...
Страница 772: ...Appendix D LINPHY Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 772 Freescale Semiconductor ...
Страница 776: ...Appendix E GDU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 776 Freescale Semiconductor ...
Страница 788: ...Appendix I MSCAN Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 788 Freescale Semiconductor ...
Страница 790: ...Appendix J Package Information MC9S12ZVM Family Reference Manual Rev 1 3 790 Freescale Semiconductor ...