MC68HC05L28 Datasheet, PDF (100/156 Pages) Motorola, Inc – Flexible general-purpose microcomputer

Power-on or external reset will clear the ADON bit, disabling the A/D converter.
ADRC
0
0
1
1
Table 9-1 A/D clock selection
ADON
0
1
0
1
RC
oscillator
OFF
OFF
ON
ON
A/D
converter
Comments
OFF A/D switched off.
ON A/D using CPU clock.
OFF Allows the RC oscillator to stabilise.
ON A/D using RC oscillator clock.
9.2.1.4 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 these bits.
Table 9-2 A/D channel assignment
CH3 CH2 CH1 CH0
Channel selected
0
0
0
0 AD0
0
0
0
1 AD1
0
0
1
0 reserved
0
0
1
1 reserved
0
1
0
0 reserved
9
0
1
0
1 reserved
0
1
1
0 reserved
0
1
1
1 reserved
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)
MOTOROLA
9-4
A/D CONVERTER
TPG
MC68HC05L28