MC68HC908LD64 Datasheet, PDF (184/362 Pages) Freescale Semiconductor, Inc – Microcontrollers

Analog-to-Digital Converter (ADC)
ADCO — ADC Continuous Conversion Bit
When set, the ADC will convert samples continuously and update the
ADR register at the end of each conversion. Only one conversion is
allowed when this bit is cleared. Reset clears the ADCO bit.
1 = Continuous ADC conversion
0 = One ADC conversion
ADCH[4:0] — ADC Channel Select Bits
ADCH[4:0] form a 5-bit field which is used to select one of the ADC
channels or reference voltages. The five channel select bits are
detailed in the Table 13-1.
NOTE:
Care should be taken when using a port pin as both an analog and a
digital input simultaneously to prevent switching noise from corrupting
the analog signal.
NOTE: Recovery from the disabled state requires one conversion cycle to
stabilize.
Table 13-1. MUX Channel Select
ADCH4 ADCH3 ADCH2 ADCH1 ADCH0 ADC Channel
0
0
0
0
0
ADC0
0
0
0
0
1
0
0
0
1
0
0
0
0
1
1
0
0
1
0
0
0
0
1
0
1
ADC1
ADC2
ADC3
ADC4
ADC5
0
0
1
1
0
↓
↓
↓
↓
↓
—
1
1
0
1
0
1
1
0
1
1
—
1
1
1
0
0
—
1
1
1
0
1
1
1
1
1
0
1
1
1
1
1
Notes:
1. If any unused channels are selected, the resulting ADC conversion will be unknown.
Input Select
PTC0/ADC0
PTC1/ADC1
PTC2/ADC2
PTC3/ADC3
PTC4/ADC4
PTC5/ADC5
Unused⁽¹⁾
Reserved
Unused
VRH
VRL
ADC power off
Data Sheet
184
Analog-to-Digital Converter (ADC)
MC68HC908LD64 — Rev. 3.0
Freescale Semiconductor