SPMCK16Z4MPV20 datasheet(194/500 Pages) FREESCALE

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ANALOG-TO-DIGITAL CONVERTER

M68HC16 Z SERIES

8-8

USER’S MANUAL

8.7.5.1 Conversion Parameters

Table 8-5 describes the conversion parameters controlled by bits in ADCTL1.

8.7.5.2 Conversion Modes

Conversion modes are defined by the state of the SCAN, MULT, and S8CM bits in

ADCTL1. Table 8-6 shows mode numbering.

The following paragraphs describe each type of conversion mode:

Mode 0 — A single four-conversion sequence is performed on a single input channel

specified by the value in CD:CA. Each result is stored in a separate result register

(RSLT0 to RSLT3). The appropriate CCF bit in ADCSTAT is set as each register is

filled. The SCF bit in ADCSTAT is set when the conversion sequence is complete.

Mode 1 — A single eight-conversion sequence is performed on a single input channel

specified by the value in CD:CA. Each result is stored in a separate result register

(RSLT0 to RSLT7). The appropriate CCF bit in ADCSTAT is set as each register is

filled. The SCF bit in ADCSTAT is set when the conversion sequence is complete.

Table 8-5 Conversion Parameters Controlled by ADCTL1

Conversion Parameter

Description

Conversion channel

The value of the channel selection field (CD:CA) in ADCTL1 determines

which multiplexer inputs are used in a conversion sequence. There are

16 possible inputs. Seven inputs are external pins (AN[6:0]), and nine

are internal.

Length of sequence

A conversion sequence consists of either four or eight conversions. The

number of conversions in a sequence is determined by the state of the

S8CM bit in ADCTL1.

Single or continuous conversion

Conversion can be limited to a single sequence or a sequence can be

performed continuously. The state of the SCAN bit in ADCTL1 deter-

mines whether single or continuous conversion is performed.

Single or multiple channel conversion

Conversion sequence(s) can be run on a single channel or on a block of

four or eight channels. Channel conversion is controlled by the state of

the MULT bit in ADCTL1.

Table 8-6 ADC Conversion Modes

SCAN

MULT

S8CM

Mode

000

001

010

011

100

101

110

111

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