MC68HC908JG16 Datasheet, PDF (252/324 Pages) Motorola, 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
ADC6
0
0
1
1
1
ADC7
0
1
0
0
0
↓
↓
↓
↓
↓
—
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
PTA0/KBA0/AD0
PTA1/KBA1/AD1
PTA2/KBA2/AD2
PTA3/KBA3/AD3
PTA4/KBA4/AD4
PTA5/KBA5/AD5
PTA6/KBA6/AD6
PTA7/KBA7/AD7
Unused⁽¹⁾
V_REFH
V_REFHL
ADC power off
Technical Data
252
Analog-to-Digital Converter (ADC)
MC68HC908JG16 — Rev. 1.1
Freescale Semiconductor