MC68HC908QY2 MOTOROLA [Motorola, Inc], MC68HC908QY2 Datasheet - Page 158

• Manufacturer Part Number: MC68HC908QY2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Analog-to-Digital Converter (ADC)
158
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
NOTE:
CH[4:0] — ADC Channel Select Bits
Recovery from the disabled state requires one conversion cycle to
stabilize.
1. If any unused 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
CH4
CH4, CH3, CH2, CH1, and CH0 form a 5-bit field which is used to
select one of the four ADC channels. The five select bits are detailed
in
analog and a digital input simultaneously to prevent switching noise
from corrupting the analog signal.
The ADC subsystem is turned off when the channel select bits are all
set to 1. This feature allows for reduced power consumption for the
MCU when the ADC is not used. Reset sets all of these bits to a
logic 1.
0
0
0
0
0
1
1
1
1
1
1
to verify the operation of the ADC converter both in production test and for user applications.
Table
Analog-to-Digital Converter (ADC)
CH3
11-1. Care should be taken when using a port pin as both an
0
0
0
0
0
1
1
1
1
1
1
CH2
Table 11-1. MUX Channel Select
0
0
0
0
1
0
0
1
1
1
1
CH1
0
0
1
1
0
1
1
0
0
1
1
CH0
0
1
0
1
0
0
1
0
1
0
1
Channel
ADC0
ADC1
ADC2
ADC3
ADC
—
—
—
—
—
—
—
—
ADC power off
Input Select
Unused
Reserved
Unused
V
V
PTA0
PTA1
PTA4
PTA5
DDA
SSA
MOTOROLA
(2)
(2)
(1)