MC68HC05X16 Datasheet, PDF (133/232 Pages) Freescale Semiconductor, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit

Freescale Semiconductor, Inc.
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.
Table 9-2 A/D channel assignment
CH3 CH2 CH1 CH0 Channel selected
0
0
0
0
AN0
0
0
0
1
AN1
0
0
1
0
AN2
0
0
1
1
AN3
0
1
0
0
AN4
0
1
0
1
AN5
9
0
1
1
0
AN6
0
1
1
1
AN7
1
0
0
0
VRH pin (high)
1
0
0
1
(VRH + VRL) / 2
1
0
1
0
VRL pin (low)
1
0
1
1
VRL pin (low)
1
1
0
0
VRL pin (low)
1
1
0
1
VRL pin (low)
1
1
1
0
VRL pin (low)
1
1
1
1
VRL pin (low)
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.
MC68HC05X16
ANALOG TO DIGITAL CONVERTER
For More Information On This Product,
9-5
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