SPMCK16Z4MPV20 datasheet(187/500 Pages) FREESCALE

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M68HC16 Z SERIES

ANALOG-TO-DIGITAL CONVERTER

USER’S MANUAL

8-1

SECTION 8

ANALOG-TO-DIGITAL CONVERTER

This section is an overview of the analog-to-digital converter module (ADC). Refer to

the

ADC Reference Manual (ADCRM/AD) for a comprehensive discussion of ADC ca-

pabilities. Refer to APPENDIX A ELECTRICAL CHARACTERISTICS for ADC timing

and electrical specifications. Refer to D.5 Analog-to-Digital Converter Module for

8.1 General

The ADC is a unipolar, successive-approximation converter with eight modes of oper-

ation. It has selectable 8- or 10-bit resolution. Monotonicity is guaranteed in both

modes.

A bus interface unit handles communication between the ADC and other microcontrol-

ler modules, and supplies IMB timing signals to the ADC. Special operating modes

and test functions are controlled by a module configuration register (ADCMCR) and a

factory test register (ADCTST).

ADC module conversion functions can be grouped into three basic subsystems: an an-

alog front end, a digital control section, and result storage. Figure 8-1 is a functional

block diagram of the ADC module.

In addition to use as multiplexer inputs, the eight analog inputs can be used as a gen-

eral-purpose digital input port (port ADA), provided signals are within logic level spec-

ification. A port data register (PORTADA) is used to access input data.

8.2 External Connections

The ADC uses 12 pins on the MCU package. Eight pins are analog inputs (which can

also be used as digital inputs), two pins are dedicated analog reference connections

(VRH and VRL), and two pins are analog supply connections (VDDA and VSSA).

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