MC68HC05B4 Datasheet, PDF (103/298 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

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 11-6 and Table 11-7). Using the A/D converter before this time has elapsed may result
in the incorrect operation of the A/D, even after t_ADON has elapsed. In this case ADON would have
to be cleared and set again.
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 8-2 for channel selection.
Reset clears the CH0–CH3 bits.
Table 8-2 A/D channel assignment
CH3 CH2 CH1 CH0
0
0
0
0
Channel selected
AN0
8
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
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)
MC68HC05B6
Rev. 4
ANALOG TO DIGITAL CONVERTER
TPG
MOTOROLA
8-5