mc68hc05pv8a Freescale Semiconductor, Inc, mc68hc05pv8a Datasheet - Page 141

• Manufacturer Part Number: mc68hc05pv8a
• Description: Mc68hc05pv8a Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

MC68HC(8)05PV8/A — Rev. 1.9
ADON – A/D On
ADTST
CH3:0 – Channel Select Bit
When the A/D is turned on (ADON = 1), it requires a time t
the current sources to stabilize, and results can be inaccurate during
this time. This bit turns on the charge pump.
This bit is for test purposes only. Write only 0.
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.
Freescale Semiconductor, Inc.
For More Information On This Product,
CH3
0
0
0
0
0
0
0
0
ADRC
0
0
1
1
Analog to Digital Converter
Go to: www.freescale.com
CH2
Table 10-1 A/D Channel Assignments
0
0
0
0
1
1
1
1
Table 10-2. A/D Clock Selection
ADON
0
1
0
1
CH1
0
0
1
1
0
0
0
1
Gives time for the RC osc to stabilize.
RC oscillator off, A/D converter off.
RC oscillator off, A/D converter on.
RC oscillator on, A/D converter off.
RC oscillator on, A/D converter on.
CH0
0
1
0
1
0
1
0
1
A/D using RC osc clocks
Channel
Comments
0
1
2
3
4
5
6
7
Analog to Digital Converter
[100mV/bit]
V
Signal
SUP
PA1
PA2
PA3
PA4
PA5
PA6
Technical Data
T
A/D Registers
J
ADON
for