HC05 datasheet(133/232 Pages) MOTOROLA

133 / 232 page

MC68HC05X16

Rev. 1

MOTOROLA

9-5

ANALOG TO DIGITAL CONVERTER

ADON — A/D converter on

The ADON bit allows the user to enable/disable the A/D converter.

1 (set)

–

A/D converter is switched on.

0 (clear) –

A/D converter is switched off.

When the A/D converter is switched on, it takes a time t

ADON for the current sources to stabilize

(see Table 12-3). During this time A/D conversion results may be inaccurate.

Power-on or external reset will clear the ADON bit, thus disabling the A/D converter.

CH3–CH0 — A/D channels 3, 2, 1 and 0

The CH3–CH0 bits allow the user to determine which channel of the A/D converter multiplexer is

selected. See Table 9-2 for channel selection.

Reset clears the CH0–CH3 bits.

9.3

A/D converter during STOP mode

When the MCU enters STOP mode with the A/D converter turned on, the A/D clocks are stopped

and the A/D converter is disabled for the duration of STOP mode, including the 4064 cycles

start-up time. If the A/D RC oscillator is in operation it will also be disabled.

Table 9-2 A/D channel assignment

CH3

CH2

CH1

CH0

Channel selected

0000

AN0

0001

AN1

0010

AN2

0011

AN3

0100

AN4

0101

AN5

0110

AN6

0111

AN7

VRH pin (high)

(VRH + VRL) / 2

VRL pin (low)

131

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