mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 343

• Manufacturer Part Number: mc68hc908lj24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908LJ24/LK24 — Rev. 2.1
Freescale Semiconductor
ADCH4
NOTES:
1. If any reserved channels are selected, the resulting ADC conversion will be unknown.
2. The voltage levels supplied from internal reference nodes as specified in the table are used to verify the operation of
the ADC converter both in production test and for user applications.
↓
0
0
0
0
0
0
0
0
0
1
1
1
1
NOTE:
ADCH3
0
0
0
0
0
0
0
0
1
↓
1
1
1
1
ADCO — ADC Continuous Conversion Bit
ADCH[4:0] — ADC Channel Select Bits
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.
Recovery from the disabled state requires one conversion cycle to
stabilize.
ADCH2
When set, the ADC will convert samples continuously and update the
ADC data register at the end of each conversion. Only one conversion
is allowed when this bit is cleared. Reset clears the ADCO bit.
ADCH[4:0] form a 5-bit field which is used to select one of the ADC
channels when not in auto-scan mode. The five channel select bits
are detailed in
↓
0
0
0
0
1
1
1
1
0
1
1
1
1
1 = Continuous ADC conversion
0 = One ADC conversion
Table 16-1. MUX Channel Select
Analog-to-Digital Converter (ADC)
ADCH1
0
0
1
1
0
0
1
1
0
↓
0
0
1
1
Table
ADCH0
16-1.
0
1
0
1
0
1
0
1
0
↓
0
1
0
1
ADC powered-off
ADC Channel
ADC28
ADC29
ADC30
ADC0
ADC1
ADC2
ADC3
ADC4
ADC5
ADC6
ADC7
ADC8
↓
Analog-to-Digital Converter (ADC)
1.2V Bandgap reference
V
V
REFH
REFL
Input Select
Reserved
(see Note 2)
PTB6
PTB7
(see Note 2)
PTA4
PTA5
PTA6
PTA7
V
LCD
—
I/O Registers
Data Sheet
343