SPMCK16Z4MPV20 datasheet(188/500 Pages) FREESCALE

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ANALOG-TO-DIGITAL CONVERTER

M68HC16 Z SERIES

8-2

USER’S MANUAL

Figure 8-1 ADC Block Diagram

8.2.1 Analog Input Pins

Each of the eight analog input pins (AN[7:0]) is connected to a multiplexer in the ADC.

The multiplexer selects an analog input for conversion to digital data.

Analog input pins can also be read as digital inputs, provided the applied voltage

meets VIH and VIL specifications. When used as digital inputs, the pins are organized

into an 8-bit port (PORTADA), and referred to as PADA[7:0]. There is no data direction

16 ADC BLOCK 2

RESULT 7

RESULT 6

RESULT 5

RESULT 4

RESULT 3

RESULT 2

RESULT 1

RESULT 0

SAR

RC DAC ARRAY

AND

COMPARATOR

ANALOG

MUX

AND SAMPLE

BUFFER AMP

CLK SELECT/

PRESCALE

AN7/PADA7

AN6/PADA6

AN5/PADA5

AN4/PADA4

AN3/PADA3

AN2/PADA2

AN1/PADA1

AN0/PADA0

VRH

VRL REFERENCE

VDDA

VSSA SUPPLY

ADC BUS

INTERFACE UNIT

INTERMODULE BUS (IMB)

RESERVED

VRH

VRL

(VRH–VRL)/2

RESERVED

MODE

AND

TIMING

CONTROL

INTERNAL

CONNECTIONS

PORT ADA DATA

Freescale Semiconductor, Inc.

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