SPMCK16Z4MPV20 datasheet(405/500 Pages) FREESCALE

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M68HC16 Z SERIES

USER’S MANUAL

D-31

PADA[7:0] — Port ADA Data Pins

A read of PADA[7:0] returns the logic level of the port ADA pins. If an input is not at an

appropriate logic level (that is, outside the defined levels), the read is indeterminate.

Use of a port ADA pin for digital input does not preclude its simultaneous use as an

analog input.

D.5.4 ADC Control Register 0

ADCTL0 is used to select 8- or 10-bit conversions, sample time, and ADC clock fre-

quency. Writes to it have immediate effect.

RES10 — 10-Bit Resolution

0 = 8-bit conversion

1 = 10-bit conversion

Conversion results are appropriately aligned in result registers to reflect the number of

bits.

STS[1:0] — Sample Time Selection

Total conversion time is the sum of initial sample time, transfer time, final sample time,

and resolution time. Initial sample time is fixed at two ADC clocks. Transfer time is

fixed at two ADC clocks. Resolution time is fixed at ten ADC clocks for an 8-bit con-

version and twelve ADC clocks for a 10-bit conversion. Final sample time is deter-

mined by the STS[1:0] field. Refer to Table D-26.

PRS[4:0] — Prescaler Rate Selection

The ADC clock is derived from the system clock by a programmable prescaler. ADC

clock period is determined by the value of the PRS field in ADCTL0. The prescaler has

two stages. The first stage is a 5-bit modulus counter. It divides the system clock by

any value from two to 32 (PRS[4:0] = %00000 to %11111). The second stage is a di-

vide-by-two circuit. Refer to Table D-27.

ADCTL0 — ADC Control Register 0

$YFF70A

NOT USED

RES10

STS[1:0]

PRS[4:0]

RESET:

Table D-26 Sample Time Selection

STS[1:0]

Sample Time

2 ADC Clock Periods

4 ADC Clock Periods

8 ADC Clock Periods

16 ADC Clock Periods

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