MC68HC05PV8 Datasheet, PDF (141/196 Pages) Freescale Semiconductor, Inc – Techinal Data - rev 1.9

Freescale Semiconductor, Inc.
Analog to Digital Converter
A/D Registers
ADON – A/D On
When the A/D is turned on (ADON = 1), it requires a time t_ADON for
the current sources to stabilize, and results can be inaccurate during
this time. This bit turns on the charge pump.
ADTST
This bit is for test purposes only. Write only 0.
ADRC
0
0
1
1
Table 10-2. A/D Clock Selection
ADON
0
1
0
1
Comments
RC oscillator off, A/D converter off.
RC oscillator off, A/D converter on.
RC oscillator on, A/D converter off.
Gives time for the RC osc to stabilize.
RC oscillator on, A/D converter on.
A/D using RC osc clocks
CH3:0 – Channel Select Bit
CH3, CH2, CH1 and CH0 form a four bit field which is used to select
one of sixteen A/D channels. Channels 8–15 are used for internal
reference points. The following table shows the signals selected by
the channel select field.
Table 10-1 A/D Channel Assignments
CH3
0
0
0
0
0
0
0
0
CH2
0
0
0
0
1
1
1
1
CH1
0
0
1
1
0
0
0
1
CH0
0
1
0
1
0
1
0
1
Channel
0
1
2
3
4
5
6
7
Signal
T_J
PA1
PA2
PA3
PA4
PA5
PA6
V_SUP / α
[100mV/bit]
MC68HC(8)05PV8/A — Rev. 1.9
Analog to Digital Converter
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Technical Data